Rear Zipper? Our all new Titan Zipper Pant made with cotton twill spandex for extra give and flexibility. It's most distinguishing - and sexy - feature is the promine circular crotch gusset, or saddle seat, visible in back, and a rear zipper going right down the center, so you are ready to go for whatever comes your way. Built with a zipper fly, belt loops and side and back pockets.