Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Latest

Serenus Silicone Sports Band for Fitbit Air

Serenus Silicone Sports Band for Fitbit Air

Regular price $54.99
Regular price $109.99 Sale price $54.99 Save $55.00

In Stock - Free Shipping With NZ Post

Band Colour: Wine
Band Width: Fitbit Air

BLACK FRIDAY: 60% OFF EVERYTHING

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Buy 2 Any 2 Bands
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  • Free Shipping
  • Easy Returns
  • 100 Days Guarantee

Slim enough to slide under your sleeve, tough enough for your toughest workouts. The Serenus keeps a low profile on your wrist with premium silicone that feels barely there during office hours but holds up through gym sessions, outdoor runs, and everything your active life demands.

It is clean, simple, and ready for anything.

Features:

  • Slim Low-Profile Design sits flat and discreet on your wrist
  • Premium Soft Silicone feels gentle against your skin
  • Lightweight Material stays comfortable all day
  • Sweat- and Water-Resistant handles workouts and wet conditions
  • Secure Metal Buckle Clasp provides firm, adjustable fit
  • Skin-Friendly Material safe for sensitive skin
  • Available in 13 Colours to suit your personal and unique style

Details & Compatibility:

  • Fits Wrist Sizes:
    • 140 to 230mm (5.5” - 9.05”)
  • Compatible With: Fitbit Air

Shipping and returns

SHIPPING

We offer FREE Tracked shipping on all orders! 📦

We offer Shipping to New Zealand only.

We process orders between Monday and Friday. Please note that we require 1 to 3 working days on average to fulfill your order before dispatching it. Rest-assured we are doing everything in our power to get your order to you as soon as possible! Once your order is dispatched, depending on your country or region, estimated delivery time is between 5 to 7 business days. Please consider any holidays or global events that might impact delivery times.

RETURNS

We offer hassle-free returns to our nearest dispatch center. To start a return just contact our support team at support@astrastraps.co.nz and we will make the process easy and effortless.

PLEASE NOTE: Due to delays caused by huge pressure on international and local shipping companies, orders may be delayed for arrival.

Our guarantee

The Astra Standard
Engineered for quality. Protected by our guarantee.
Premium Build
Rigorous QC checks ensure every strap meets the highest tier of durability.
100-Days Guarantee
Full coverage against defects, Faults. 
Insured Shipping
Free tracked shipping on all orders. Transit protection included.

Size guide


At Astra Straps, all our straps have specific and clear sizes indicated. Please check the sizing guide below before ordering. If you are still unsure, you may contact us here.

1. How do I know my wrist size?

Simply use a flexible measuring tape to wrap around your wrist and record the measurement on the tape that overlaps the zero end of the tape OR just grab any string/paper strips to do the same, then lay the string on a ruler to get your accurate wrist size.

In most cases, knowing your wrist size/length will be sufficient. Check your wrist size against the size of the strap that you wish to purchase on the individual product details page.

From there, you can select and purchase our watch straps: Small (S), Large (L) or Free Size.

2. What is the watch band width / watch lug measurement?

In certain cases, knowing your wrist size alone may not be sufficient. In such a scenario, you will need the watches' band width size, also know as the watch lug width size.

Your Apple watch will say the measurement on the back.

If you cant find the size on the back place the watch with the watch face facing up. Take the measurement of the distance between the lugs (where the watch strap fits).

For Apple Watches the you have the choice between 38MM, 40MM, 41MM, 42MM, 44MM, 45MM & 49MM, you can also enter your watch model number into a search engine to find what size your watch uses.

Apple Watch 7, 8, and 9: The Apple Watch Series 7, 8, and the newly released Series 9 are compatible with a wide range of our bands, including sizes 38MM, 40MM, 41MM, 42MM, 44MM, 45MM, and 49MM. For watch cases, they fit the 41MM and 45MM sizes.

Apple Watch Ultra and Ultra 2: The recently introduced Apple Watch Ultra and Ultra 2 are compatible with 45MM and 49MM bands. As for the watch cases, both the Ultra and Ultra 2 models are available in a 49MM size.

Using these three measurement data points, you are now ready to grab your strap! 

Ask a question

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Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps
Serenus Silicone Sports Band for Fitbit Air - Astra Straps

Questions? We've Got Answers! ⭐

Real talk about your new favorite watch band

Will this actually fit my watch?

Absolutely! Whether you’re rocking the original Series 1 or the latest model, we’ve got you covered. Just check the size on the back of your watch (if you're not sure), and we'll handle the rest. It’s that easy.

What makes Astra Straps different?

Great question! At Astra Straps, we don’t just make bands – we craft them.

Every single band is hand-finished to ensure the highest quality and attention to detail. We’re all about combining top-notch materials with unique designs that reflect your personal style.

Plus, we test every band for comfort and durability, so you can count on a strap that’s as strong as it is stylish. When you choose Astra Straps, you’re not just getting a band – you’re getting a piece of wearable art.

Is it really comfortable, or just good-looking?

Why settle for one when you can have both? Our bands are designed to look amazing and feel just as great.

We’ve obsessed over comfort, so you don’t have to. No weird pinching or “I need to take this off” moments – just a band that feels as good as it looks.

Will it stand up to my crazy life?

We’ve put our bands through the wringer because we know you don’t have time to baby your watch.

Whether you're hitting the gym, caught in the rain, or dealing with your most accident-prone friend, these bands are built to last. Bring on the hustle!

How do I pick the right size?

Most people use a tape measure (or even just a string) to wrap around their wrist, then add half an inch. But don’t stress – most of our bands are super adjustable, so unless your wrists are tiny or extra large, the standard size should work just fine. Still not sure? Reach out to us, we’re here to help!

What if I don’t love it?

We get it – sometimes things just don’t work out. If you’re not in love within 100 days, send it back, no questions asked. We’ll refund you, no drama. We want you to have a band you absolutely love.

When will it get here?

We’re all about speed. Most orders ship within 1-2 days, and you can expect it to arrive shortly after.

And the best part? Shipping is free—because let’s be real, no one wants to pay extra for shipping.

Do I need to buy anything else?

Nope! We believe in keeping things simple. Everything you need is in the box. No sneaky extra fees or “must-have” connectors. Just open it, snap it on, and you’re good to go.

How do I keep it looking fresh?

Super easy! Silicone bands just need a quick rinse with soap and water. Leather ones? Just a gentle wipe down.

Metal ones can be cleaned with a soft cloth. And don’t worry – we’ll send you a full care guide, but these bands are pretty low maintenance.

  • 5 stars: 44 (90%)
  • 4 stars: 5 (10%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
B
Bianca Kingi
A fresh look for my tracker

Changing the band colour is an inexpensive way to refresh a fitness tracker. I'd go with pink for a softer look.

C
Charlize Rewi
So many pretty shades

The pink and lavender options are lovely! I'm glad the collection isn't limited to basic black and white.

G
George Hohepa
Classic black wins again

Nothing complicated here, which I appreciate. I'd choose black because it works with gym clothes and office outfits alike.

H
Hemi Fletcher
I'd choose two colours

The green for casual days and black for everything else. The colour selection makes it tempting to have a spare.

E
Erana Petersen
Love the wine colour

That deep wine shade is beautiful. It feels a little more sophisticated than the brighter red option.

S
Sonny Pene
The white is really fresh

White looks so crisp in the product photos. I'd love the appearance, although I might choose grey for easier upkeep.

M
Moana Searle
The green is surprisingly nice

I usually buy neutral accessories, but this muted green is tempting. It's colourful without being neon.

A
Anahera Tipene
Simple and exactly my style

I prefer a plain band over anything fancy. The black silicone has a clean look and the buckle design is straightforward.

M
Maia Pickering
Finally, some colour options!

Lavender, wine, green, orange... there's actually a good range here. I'd pick lilac for everyday wear and red for something brighter.

T
Tane Langridge
The buckle makes sense

I'm not a fan of magnetic closures for exercise. A regular metal buckle with adjustment holes is much more my style.

K
Keira Mackie
That orange one though!!!

The orange band immediately caught my attention. It would add a fun pop of colour to an otherwise simple fitness tracker.

M
Mikaere Ellis
Nice replacement option

My favorite thing about this design is how uncomplicated it is. Smooth silicone, adjustable holes and a traditional fastening system.

N
Ngaire Harding
Would go with fog grey

The fog gray shade looks understated and modern. It's a nice alternative to black without being too colourful.

D
Dylan Moke
Perfect for an active routine

A silicone band that can be wiped down after a workout is exactly what I look for. The simple shape is a plus.

B
Braxton Clarke
A practical everyday band

The adjustable holes are useful, although I wish the listing showed more close-ups of the buckle from different angles.

P
Paora Weston
No complicated fastening!!!

Sometimes a regular buckle is all you need. I like that the band has several holes for finding a comfortable fit.

T
Tia Bodie
Cute lilac shade

The lilac option has such a soft look. I'd pair it with a white or silver fitness tracker for a clean colour combination.

C
Cohen Albright
Good for switching styles

I like having a few band colours to rotate depending on what I'm wearing. The simple design makes that easy.

L
Leilani Forsyth
Not too bulky

The slim shape appeals to me. I don't want a huge wristband when I'm just tracking my steps during the day.

S
Sina Menzies
Bright red looks great

The red is bold without needing any extra patterns. It would be a nice choice for someone who likes colourful workout accessories.

E
Eru Chalmers
A good basic design

I appreciate the simple construction. My only hesitation is that I'd like to know the exact wrist-size range before choosing.

P
Poppy Westlake
WOW, the colour selection!

I counted so many options that choosing just one would be difficult 😂 The mid blue and lavender are my favorites.

O
Otis Henare
For my daily walks

I prefer silicone bands for walking and outdoor activities because they're easy to clean. This looks like a sensible replacement.

R
Rawinia Walsh
Mid blue is my pick

The blue shade is cheerful without being overly bright. It would look great with a casual T-shirt and jeans.

A
Anaru Fairburn
Love the minimal look

No patterns, no oversized hardware, just a neat silicone band. Sometimes simple really is better.

N
Nikau Boyd
The metal pin is a nice detail

The little metal fastening pin gives the band a familiar, secure-looking closure. I prefer this style to complicated clasps.

J
Jodie Soper
Soft colours are lovely

The white, grey and pale pink options are especially pretty. They have a clean look that works with almost anything.

C
Callum Ratana
Nice for casual wear

The design is straightforward and versatile. I'd probably choose a darker shade because pale silicone can show marks more easily.

A
Aroha Davies
That purple shade!!!

I'm definitely drawn to the lavender. It's a fun colour without being as loud as orange or red.

W
Wiremu Tahu
Easy to coordinate

I like accessories that don't clash with my clothes. Black, fog grey or wine would all be good everyday choices.

C
Charlotte Edgecombe
The band holes are useful

Being able to choose the fastening position is important to me. I like the traditional adjustable layout shown here.

J
Jordan Whetu
Great range for different tastes

Some people love bright orange while others want basic black. It's nice to see both ends of the spectrum covered.

M
Mabel Begley
Orange for the gym!

I love bright fitness accessories, so orange would be my first choice. It's much more fun than another black band.

Why 100,000+ Customers Choose Astra Straps

390+ Styles. Premium quality. Prices that actually let you switch it up.

Endless

Style

Match every mood,
outfit, occasion

Premium

Materials

No cheap

plastic here

Built

To Last

Survives workouts, adventures, life

Perfect

Fit

Comfortable

from day one

100 Day

Warranty

We’ve got you covered for 100 days

  • “I recently got the Astra Apple Watch band and am very impressed with its quality and stunning design. Right from the packaging, it was clear this band was made with great care. The premium-grade silicone is soft against the skin, comfortable for all day wear, and durable enough for an active lifestyle. Im thrilled with my purchase."

  • “Don't waste money on expensive Apple bands. This one is stylish, fits well, and is excellently made. You can get several of these for the price of one official band."

  • “Ive had many Apple watch bands over the years, and this is the best, coolest, and most comfortable one yet. It makes the watch look extremely upscale. A friend paid much more for the same band elsewhere and couldn't believe my price. Highly recommended. Love!"

  • “Amazing quality, very flexible and not stiff like other straps. Doesn't have that cheap band smell. Highly recommend, and great to have the option to match the strap color with my style."

  • “I was looking for a band thats not only exceptionally comfy but also stylish and durable. These bands tick all those boxes. I appreciate the bands design where it tucks in neatly. My original band caught on everything, but this one has a much smoother design. I love it!"

  • “Astra Straps' customer service is top-notch. I had a question about sizing, and they responded promptly with helpful guidance. It's refreshing to see a company that values its customers."

  • “Astra Straps has been a game-changer for my watch collection! Their bands are not only stylish but incredibly durable. I've swapped out all my old bands for Astra and couldn't be happier."

  • “The watch bands fit perfectly around my wrist as there are plenty of holes to adjust to my wrist size. The colors are very nice. The feel of the band is smooth. The way the band clasps is a plus as it is very secure on my wrist."