My Cart

 Chafe free
//  Seamless
//  Moisture wicking

10 Top Tips For Running in the Summer

10 Top Tips For Running in the Summer
Posted on
Advice for running in the heat... The summer months are upon us - here are a few tips to help you run in comfort as the temperature warms up.

What is Chafing?

What is Chafing?
Posted on
What is chafing? Chafing is a friction-induced skin injury where the outer layer of skin (epidermis) is rubbed creating microscopic tears, exposing the skin layer below (dermis), which becomes red,...

Runderwear Out & About This Spring/Summer

Runderwear Out & About This Spring/Summer
Posted on
Runderwear will be out and about at various marathons and running events this summer. We look forward to meeting you there!

20 Top Tips for a Great Marathon

20 Top Tips for a Great Marathon
Posted on
Our top 20 tips for running a great marathon, including advice on training, nutrition, pacing and race day.

Enter your email below to get 10% off your first order

You’ll receive an email - click confirm (takes 2.2 seconds) and you’ll receive your code.

No email? Contact us at

performance underwear
★ Read Our Reviews

Let customers speak for us

2286 reviews
Tracy Symes said: Comfortable Underwear

Very comfortable, I never run in any other underwear now.

T W said: Great purchase

Amazingly comfortable and breathable. Looking forward to putting them through their paces.

Jane Marshall said: Perfect

So comfortable that you forget you’re wearing them. Nice fit, really good quality fabric, love them

Jordan said: #1 Undies!

I bought these in white after reading lots of good reviews. The reviews were right! These are amazing! I wore them hiking and I didn’t have any problems, no chafing, pinching, or any discomfort. I forgot I had them on! They are nice and supportive and keep everything in place while staying cool and not being too tight. A little pricey (mostly shipping to US) but I will probably buy more sometime!

Verka Lafeuille said: Impressively good.

Tested on a 38 mile ultra and I had no chafing for the first time in my life