The Men's Loose Fit USA MTB Shorts are a two-part bottom: a durable shell and a breathable mesh liner. The outer shell is very soft yet rugged, made of 100% four-ply nylon fabric that can endure rocks, brier bushes, abrasion, harsh dirt, and jagged terrain during mountain bike riding. The internal garment is a breathable, stay-dry micro mesh that is a durable stretch mesh. This garment has two hand pockets and a mesh cooling zone in the back. The BKP Crotch pad is a dense, long-lasting foam for anti-shock and comfort. This shock-absorbing cellular urethane is designed to absorb shock for the life of the short. This pad resists abrasion and is smooth and wrinkle-free. The pad's cells are an "open cell structure" that allows water transportation while maintaining its ability to absorb shock without bottoming out.