Vibram FiveFingers Size Chart Featuring with a soft upper and perforated to maximize breathability, this model is very comfortable. This is an ideal running shoe for those making the transition from traditional footwear to a more minimalist approach. The thin sole construction lets you feel your run, connecting you to the true barefoot running experience. Please Note: Product runs slightly large, consider ordering one size smaller. Features:. - VI-Lite Compound: Optimum balance of lightness and durability - Insole: 2mm EVA Anti-Microbial Drilex Sockliner * Midsole: 4mm EVA - Rubber thickness: 2.5mm - Upper Material: Polyester Lycra Stretch Mesh + Polyester Microfiber - Vegan