Imported Rubber sole Nothing will be able to break your stride when you're wearing the Altra Footwear Superior 5 running shoe. Improved breathability and better drainage. Lace-up style. Signature FootShape comfort toe box gives your feet more space to relax and sit naturally and is designed to address biological differences in men's and women's feet. Contour footbed with removable StoneGuard. Nothing will be able to break your stride when you're wearing the Altra Footwear Superior 5 running shoe. Improved breathability and better drainage. Lace-up style. Signature FootShape comfort toe box gives your feet more space to relax and sit naturally and is designed to address biological differences in men's and women's feet. Contour footbed with removable StoneGuard. Balanced Cushioning platform positions your heel and forefoot at an equal distance from the ground, encouraging better alignment, better form, and a low impact landing. Quantic foam offers a luxurious and lightweight cushioned midsole, designed for miles and miles of comfort. Gaitertrap hook-and-loop tab allows strapless gaiter attachment that prevents debris build-up beneath the shoe. Grippy MaxTrac outsole provides the perfect combination of grip, traction, and durability on all types of terrain. Trailclaw canted lugs on the outsole are strategically placed beneath the metatarsals to provide added traction underfoot. Innerflex These grid-like grooves in the midsole are designed to provide flexibility and movement. Textile and synthetic upper. Textile lining and insole. Synthetic outsole.