Hi! A little too small for me so looking for someone else to get some life out of them. Very minimal wear from one run. Some info from TYR: RD-1 Runner combines a Surge NRG Foam midsole with a durable engineered mesh upper to provide unparallelled comfort and response, while the 10mm heel-to-toe drop maintains support and accelerates power. Designed to complement a runner's natural movement, TYR's RD-1 enhances stride and speed so you can go the distance. Technology -Surge NRG Foam, a responsive and durable base that supports and reacts to a runner's energy output. Features - Engineered mesh upper - Reinforced side support guards - Molded sockliner - 10mm heel-to-toe drop - 4mm grooved outsole Material -100% polyester engineered mesh upper -EVA Surge NRG midsole foam -2 mm EVA Strobel -Rubber Outsole