Road or trail, the choice is yours. Enjoy the versatility of the Terrafly™ 313 GORE-TEX® from inov-8®. A versatile running shoe designed to stand up to the rigors of both road and trail running. Lightweight mesh upper with hardy, supportive synthetic overlays. GORE-TEX membrane ensures waterproof protection from the elements, while maintaining a cool, breathable environment. Extended rubber toe rand for extra protection. Plush tongue and collar for added comfort. 3 Arrow Shoc-Zone™ offers maximum underfoot protection. Heel/Toe Offset: 18mm/9mm. Differential: 9mm. TerraFly™ outsole is designed to handle hardpacked terrain with ease. S™ (Sticky) Compound was developed from climbing rubber technology to provide optimal wet traction. Its average lifespan is 600 miles. Anatomic™ fit is based on the foot"s shape, making for the most comfortable, relaxed fit. Measurements: Weight: 12 oz Product measurements were taken using size UK 9.5 (US Men"s 10.5), width D - Medium. Please note that measurements may vary by size.