Nike Rio II Warm-Up Pants - Boys' Grade School Celebrate every victory like it is Carnival in the Nike Rio II Warmup Pant. These poly knit warmup soccer pants provide you with front pockets, an elastic waist with drawcord and zippered legs as you party on the pitch. The Nike branding lets you know you are running this victory celebration with one of the game's elite names. Score a parade of points in the Nike Rio II Warmup Pant. 100% polyester. Imported.