Fabric type: 80% Polyester, 20% Spandex FLEXIBLE & BREATHABLE: The men's cycling underwear 4D is made of polyester dense mesh fabric, which is more breathable, lightweight, quick drying and opaque, feeling comfortable like a second skin. ANTI-SLIP LEG GRIPS: After collecting a lot of feedback, we have upgraded the length and cuffs of the bike shorts for men. 6" inseam with anti-slip leg grips to maximally prevent leg curling up, making the shorts stay in place while riding. ERGONOMIC 4D PAD: This cushion has been tested by our experience officers and some old customers, increased comfort, more stability and shock absorption, providing decent protection on your bike saddle under 50 miles riding. POCKET & WAISTBAND: Designed a unique side pocket for storing small items such as card, keys. Elastic and wide waistband offers a snug fit, suitable for a variety of body types. ULTIMATE KIT FOR CYCLING: This is an exclusive underwear for cycling enthusiasts, not only suitable for MTB liner, but also can be used as bike shorts directly, or daily leisure cycling, motorcycles, indoor spinning, etc.