How do you pump? Athlete-inspired style from the '90s and '00s defines these Reebok Instapump Fury Original unisex retro running, lifestyle shoes in Grey. An iconic pump and slip-on style give them a retro vibe. A ballistic nylon upper with shiny patent leather accents creates a stand-out look. Ballistic nylon upper with patent leather details. The Pump iconic technology offers a customized, locked-in fit. Soft Hexalite hexagonal cushioning; Foam sockliner adds lightweight comfort. Rubber outsole for durability and traction. Slip-on construction; Tongue and heel pulls.