What are you looking for?

Mens Womens

Save up to 33% off with bundles.

How to get started

Select your gender from the dropdown above

Choose your size to view available products

Select and add products to claim your offer

ⓘ

Selected product is not available in this size

Your selection. Click to edit.

0 of 0 items added

Size Guide

Size	AU/NZ	UK	US
XS	8A 8B 10A	30A 30B 32A	30A 30B 32A
Small	8DD 10B 10C 10D 10DD 12A 12B	30DD 32B 32C 32D 32DD 34A 34B	30DD 32B 32DD 32C 32D 34A 34B
Medium	12C 12D 12DD 12E 14A 14B	34C 34D 34DD 34E 36A 36B	34C 34D 34DD 34DDD 36A 36B
Large	14C 14D 14DD 14E 16A 16B 16C	36C 36D 36DD 36E 38A 38B 38C	36C 36D 36DD 36DDD 38B 38C
XL	16D 16DD 16E 18A 18B 18C 18D	38D 38DD 38E 40A 40B 40C 40D	38D 38DD 38DDD 40A 40B 40C 40D

Size	AU Size	UK Size	Waist (cm)
XS	04-06	00-02	60
Small	08-10	04-06	64
Medium	12-14	08-10	68
Large	16-18	12-14	72
XL	20-22	16-18	76
2XL	24-26	20-22	80

Size	Waist (cm)	Waist (in)
2XS / (Size 4/8)	53-56	21-22
XS / (Size 8/12)	57-66	23-26
Small	67-76	27-30
Medium	77-86	31-34
Large	87-97	35-38
Extra Large	98-107	39-42
2XL	108-115	43-45
3XL	116-125	46-49
4XL	126-133	50-52
5XL	134-143	53-56
6XL	144-150	57-59

Size	Waist (cm)	Waist (in)
4XS (Age & Size 3-4)	40-44	15-17
3XS (Age & Size 5-6)	45-51	18-20
2XS (Age & Size 7-8)	52-59	21-22
XS (Age & Size 9-11)	60-69	23-26
S (Ages & Size 12-14)	70-76	27-30

30-DAY FIRST PAIR GUARANTEE & FREE SHIPPING

Open search

Mens
Womens
Kids
FSC & Sustainability
About Us
FAQs
Clearance
- Mens Clearance
- Womens Clearance

Step One UK

Open search Open account page Open cart

About Us
FAQs

Find Your Perfect Pair

Shop All
Discover The Range
Boxer Brief
Thicker Legs
Cloud Mesh Boxer Brief
Extra Cooling Power
Trunk
Shorter Length
Boxer Brief Fly
Front Fly
Cloud Mesh Sport
Extra Cooling Power
Sport
Longer For Movement
Long Johns
Full Length

Shop All
Discover The Range
SmoothFit Padded Bra
Lift & Support
SmoothFit Thong
Less Coverage
SmoothFit Boyleg
High Waisted
SmoothFit Bikini Brief
Classic Cut
SmoothFit Full Brief
Full Coverage
Bikini Brief
Classic Cut & Prints
Body Short
Lounging & Anti Chafe

Boys
Junior Trunk
Girls
Girls Shortie

Ethical
Ethical
Compost
Compost
Bamboo
Bamboo

Mens Clearance
Great Value
Womens Clearance
Great Value

SHOP MEN'S SHOP WOMEN'S SHOP JUNIOR'S

Women's Bamboo Underwear

Seam Free Bikini Brief Boxer Brief

Filters

Sort by

Featured

Best selling

Alphabetically, A-Z

Alphabetically, Z-A

Price, low to high

Price, high to low

Date, old to new

Date, new to old

Colour

Red Blue Green Yellow White Black Orange Pink Purple Grey Multicoloured Brown Nude Mystery Light Beige Pink Beige Tan Ash Brown

Size

2XS

Small

Medium

Large

2XL

3XL

4XL

5XL

Shape

Bikini Brief

SmoothFit Thong

SmoothFit Bikini Brief

SmoothFit Full Brief

SmoothFit Bra

SmoothFit Boyleg

Body Short

Gender

Womens

Price

£ to £

In stock only

Filters

Sort by:

Colour

Red Blue Green Yellow White Black Orange Pink Purple Grey Multicoloured Brown Nude Mystery Light Beige Pink Beige Tan Ash Brown

Size

2XS

Small

Medium

Large

2XL

3XL

4XL

5XL

Shape

Bikini Brief

SmoothFit Thong

SmoothFit Bikini Brief

SmoothFit Full Brief

SmoothFit Bra

SmoothFit Boyleg

Body Short

Gender

Womens

Price

£ to £

In stock only

212 products

Women's SmoothFit Boyleg - Marina

Sale price£13.00

Women's SmoothFit Padded Bra - Marina

Sale price£19.00

Women's SmoothFit Full Brief - Marina

Sale price£13.00

Women's SmoothFit Bikini Brief - Marina

Sale price£12.00

Women's SmoothFit Thong - Marina

Sale price£10.00

Women's Bikini Brief - Capricorn

Sale price£12.00

Women's Bikini Brief - Nicole

Sale price£12.00

Best Seller

Women's Body Shorts - Nicole

Sale price£15.00

Women's Bikini Brief - Aquarius

Sale price£12.00

Save 13%

Women's Body Shorts - Retro Romance

Sale price£13.00

Regular price£15.00

Save 17%

Women's Bikini Brief - Retro Romance

Sale price£10.00

Regular price£12.00

Women's Bikini Brief - Jessica

Sale price£12.00

Women's Body Shorts - Jessica

Sale price£15.00

Women's Bikini Brief - Neon Tags

Sale price£12.00

Women's Body Shorts - Michelle

Sale price£15.00

Women's Body Shorts - Rebecca

Sale price£15.00

Women's Body Shorts - Karen

Sale price£15.00

Women's Bikini Brief - Michelle

Sale price£12.00

Women's Bikini Brief - Rebecca

Sale price£12.00

Women's Bikini Brief - Karen

Sale price£12.00

Save 17%

Women's Bikini Brief - Zero Lucks Given

Sale price£10.00

Regular price£12.00

Save 67%

Women's Body Short - Mystery 7x Pack

Sale price£35.00

Regular price£105.00

Save 50%

Women's Body Short - Mystery 4x Pack

Sale price£30.00

Regular price£60.00

Women's SmoothFit Boyleg - Tan

Sale price£13.00

7 / 9

Subscribe to our newsletter to stay in the loop!

By signing up you agree to receive recurring automated marketing messages from Step One™. View Terms & Privacy.

Shop

Boxer Brief
Boxer Brief Fly
Trunk
Boxer Brief Sport
Long Johns
Women's Matching Sets
Women's Body Shorts
Women's Bikini Brief
Gift Cards

Investors
Gift Cards
Contact Us
FAQ's
Terms & Conditions
Privacy Policy
Cookie Policy
Spam Policy
Terms Of Use
Refer a Friend Terms and Conditions
Terms & Conditions – Win a metallic iPhone 17 Pro
VIP Sale Terms and Conditions
Win Your Order - Period Underwear

Step One Ltd acknowledges the Traditional Custodians of the land on which we operate, live and gather as employees & colleagues, and recognise their continuing connection to land, water and community. We pay respect to Elders past and present.

About Us

Step One is a leading direct-to-consumer online retailer for underwear. Step One offers an exclusive range of high quality, organically grown and certified, sustainable, and ethically manufactured underwear that suits a broad range of body types. Step One has transformed the underwear market with an innovative design and cult-like following and has quickly grown into a multinational company operating in Australia, the US and the UK.

Save up to 15% off your order using our Bulk Discount

£1.00 £3.00 £5.00