The Mistral GTX is a performance lightweight trail boot that can also be used for lightweight backpacking. Combination nylon and suede upper. Bi-directional ankle flex provides ankle support. Extended Comfort GORE-TEX membrane provides protection with maximum breathability. Nylon insole. PU injected midsole. TPU shank provides support without weight. Durable Vibram Energy outsole provides reliable traction in all conditions. Measurements: Weight: 1 lb 7 oz Shaft: 5 1 4 in Product measurements were taken using size 44.5 (US Mens 11), width D - Medium. Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.