Perform at your peak

You choose CSX® because they are undoubtedly the most comfortable and supportive men’s underwear and swimwear on the planet!

CSX® underwear is made from technologically advanced SUPPLEX® fabric. It’s very soft, breathable, long lasting, holds it shape well and because it also contains LYCRA®, it’s incredibly comfortable to wear.

The pouch gives the support and reassurance of a jockstrap but without being bulky or constrictive, perfect for high activity sports and active men in general.

And CSX® swimwear is made from the highest quality LYCRA® with excellent chlorine resistance, UV protection (varies according to style) and performance focused cut, perfect for high intensity water sports.

When you buy from CSX® online your products are shipped immediately and come with a money back guarantee.

So if you’re ready to perform at your peak, you’re ready to choose CSX®!


"Incredible undies; perfectly tailored to deliver the ideal combination of support and comfort."

Josh Williams
Marathon runner and satisfied CSX customer