The Thor is that lightweight boot, with a stiffer than usual board last making this the ultimate backpacking boot since you'll get the support that you need when carrying heavy loads. Not to mention it has Crispi's ABSS (Anke Bone Support System) that really ties this support in perfectly. Much like the Idaho and Wyoming in the Crispi lineup, the Thor utilizes the Injected Wireframe around outer top part of your foot. This allows incredible strength, support and a more secured lacing feel. Not to mention this boot is Aron Snyder "Gritty Approved"!Comes in different color stylesUpper is a unique mixture of Cordura, synthetic materials as well as an Injected Wireframe/li>GORE-TEX(R): Comfort footwear lining Dual Density EVA MidsoleVibram(R) rubber sole with micropore shock absorbing midsoleStitched PU (polyurethane) coated leather full randSizing Chart Conversion