4SR Kevlar Jeans Sport Classic II is unobtrusive, stylish and offers great protection.This is a motorcycle pants made of 14 ounces denim, in the knees and buttocks fiber DuPont Kevlar® reinforced. Each knee has a top pre-formed knee protector Safe Tech, which is in patented pockets, with the possibility to adjust it. Thanks to the sewn-in protector pockets, the protectors remain fixed and do not hang anywhere in the Kevlar jeans. 4SR jeans are different, unique and the only ones. Watch the video comparing common motorcycle jeans and 4SR motorcycle jeans.4SR patented system guarantees you that your knee and tibia are always protected.