Vibram FiveFingers Spyridon EVO Trail Shoes Introducing the Spyridon EVO - the ultimate trail shoe evolution! Experience durability, breathability and lightweight design like never before, perfect for trail running, hiking, obstacle courses and anything Mother Nature throws your way. Polyester Upper Designed using a breathable yet durable upper, the Spyridon EVO from Vibram FiveFingers allow your feet to breathe allowing air to enter the shoe keeping the feet well-ventilated. The Polyester material ensures efficient moisture management by wicking away the build-up of excess sweat and moisture, leaving your feet cool, dry and comfortable as you strive for the best results and performance. Additionally, the upper boasts resilience and protection by containing extra-resistant sections for a secure fit. Completing the upper is a secure hook-and-loop strap closure system that provides added stability as well as a secure and comfortable fit. Vibram Megagrip 3.5mm Rubbe