Free shipping within the UK & worldwide over £100

Collection: Products

Cloud wrap crop top

Cloud wrap crop top

Regular price CHF 46.72

Regular price Sale price CHF 46.72
Unit price per
Crop top navy blue

Crop top navy blue

1 total reviews

Regular price CHF 36.94

Regular price Sale price CHF 36.94
Unit price per
Cuffed Trousers

Cuffed Trousers

Regular price CHF 74.98

Regular price Sale price CHF 74.98
Unit price per
Define Jumpsuit

Sale

Define Jumpsuit

1 total reviews

Regular price CHF 40.20

Regular price ~~CHF 88.01~~ Sale price CHF 40.20
Unit price per

Sale
Double Airbrushed Pilates Set – Leggings & Sports Bra

Double Airbrushed Pilates Set – Leggings & Sports Bra

Regular price CHF 94.53

Regular price Sale price CHF 94.53
Unit price per
Dusty pink leggings

Sale

Dusty pink leggings

1 total reviews

Regular price CHF 44.55

Regular price ~~CHF 60.85~~ Sale price CHF 44.55
Unit price per

Sale
Elegant crop top

Elegant crop top

Regular price CHF 41.29

Regular price Sale price CHF 41.29
Unit price per
Flared jumpsuit

Sale

Flared jumpsuit

Regular price CHF 46.72

Regular price ~~CHF 93.45~~ Sale price CHF 46.72
Unit price per

Sale
Flared jumpsuit unitard

Sold out

Flared jumpsuit unitard

Regular price CHF 46.72

Regular price ~~CHF 93.45~~ Sale price CHF 46.72
Unit price per

Sold out
Flared leggings and sports bra set

Flared leggings and sports bra set

3 total reviews

Regular price CHF 93.45

Regular price Sale price CHF 93.45
Unit price per
Flared unitard

Sold out

Flared unitard

Regular price CHF 96.71

Regular price Sale price CHF 96.71
Unit price per

Sold out
Flowline sports bra

Flowline sports bra

4 total reviews

Regular price From CHF 42.38

Regular price Sale price From CHF 42.38
Unit price per
Gift Card

Gift Card

Regular price From CHF 10.87

Regular price Sale price From CHF 10.87
Unit price per
Girls tennis skirt

Girls tennis skirt

Regular price CHF 21.72

Regular price Sale price CHF 21.72
Unit price per
Grand slam tennis set 🏸

Grand slam tennis set 🏸

Regular price CHF 73.89

Regular price Sale price CHF 73.89
Unit price per
High support sports bra

High support sports bra

3 total reviews

Regular price CHF 42.38

Regular price Sale price CHF 42.38
Unit price per

Zero feel set

Elevate Your Style with Fresh Arrivals from Our Just Landed Collection!

Flared unitard

Flared unitard

Sold out

Flared unitard

CHF 96.71

CHF 96.71

Sold out

Clearance Sale

End of season clearance SALE Please note products are not refundable but...

Clearance Sale

THE REQUIREMENTS Be an Instructor or Influencer. Put Your Ambassador Status in Your IG Bio. Post 2x Per Month.

Apply now

Let customers speak for us

from 285 reviews

Gorgeous soft pink

Obsessed with this sports bra love all colours but soft pink is like eating marshmallows.

Angela B

11/21/2025

Flowline sports bra

Flowline sports bra

Burgundy set

So pleased with this set. The perfect colour for autumn/winter. Beautiful burgundy colour. Can't wait to wear it.

Channelle Myers

11/10/2025

Pilates leggings set

Pilates leggings set

Leggings

First purchase from Belsize of leggings for Pilates. Great fit and so pleased with quality. Will definitely purchase again and recommend.

Lynne Smith

10/27/2025

Dusty pink leggings

Dusty pink leggings

So beautiful to move in

I love this jumpsuit so much. It feels like a second skin when on. The colour is beautiful, too. I especially loved the scallop-crossed back. It's a definite must-buy in any colour.

Channelle Myers

10/17/2025

Scalloped jumpsuit

Scalloped jumpsuit

Beautiful unique set

Don’t hesitate to buy. Beautiful sets. Sculpt the body nicely. Love them.

Channelle Myers

09/19/2025

Scallop cross back matching set

Scallop cross back matching set

As a yoga teacher, I wash my activewear every single day. This is the only bra that hasn’t lost its color or shape absolutely amazing

Courtney

09/17/2025

White sports bra

White sports bra

Great support

Top of excellent quality leggings are like second skin

A****ra

09/17/2025

Pilates leggings set

Pilates leggings set

Second skin

Like a second skin probably the most comfortable leggings

Ana

09/17/2025

Pilates leggings set

Pilates leggings set

Stunning

Beautiful colour perfect fit. I wish I knew earlier for Belsize. Best price

Jordan

09/17/2025

Flared leggings and sports bra set

Flared leggings and sports bra set

My second colour

Bought fist set in brown colour it hold my tummy extremely well, absolutely love coral 🪸 colour. Temptation for the black set 👀

Jady

09/17/2025

Autumn Shades You’ll Live In

Autumn Shades You’ll Live In

The best gym set

I first bought only pocket leggings after wearing them daily they are still the same. I have treated my self with full set. Very good quality

Tamara

09/17/2025

Pocket leggings & sports bra

Pocket leggings & sports bra

Absolutely amazing

Love the fabric but finally pockets that hold my phone. Very comfortable. I wish they have in more colours.

Tamara

09/17/2025

Pocket leggings

Pocket leggings

Unbelievable love it

After giving birth, I honestly thought I’d never feel confident in leggings again but this Scallop Set holds my mummy tummy in beautifully! 💖 The quality is amazing, and the sports bra gives strong support even though it’s a one shoulder design. I’ve already ordered another colour before it sells out again!

Stacey

09/09/2025

Scallop pilates set

Scallop pilates set

Wearing it every day, everywhere! Obsessed

I paired it with the pink padded top and honestly felt like a total tennis babe! The fit is super flattering, not too short, and moves perfectly on the court. The fabric is soft but supportive, I’ve worn it for both tennis and running it’s that cute. Definitely a must-have set! 🎾💗 We’ll done Belsize

Harper.S

06/08/2025

Women’s Padel and Tennis Skirts – Stylish Skorts for Tennis & Picklebal

Women’s Padel and Tennis Skirts – Stylish Skorts for Tennis & Picklebal

Gorgeous set

I have the black and aubergine and I love them both and love to interchange the tops and bottoms.

Laura

05/23/2025

Scallop pilates set

Scallop pilates set