Please click for the La Sportiva Size Conversion. Traverse through alpine terrain in total confidence wearing the La Sportiva Stream GTX hiking boot! Mid-cut hiking boot in an innovative design. Durable abrasion-resistant mesh upper provides protection while Nano Cell 2.0 structure provides maximum breathability. PU TechLite toe and heel for added durability. Nano Cell 2.0 Technology works with Gore-Tex Surround aeration channels within the footbed and midsole for 360 degree breathability. STB control system integrates Gore-Tex Surround ventilation outlets and provides a comfortable, snug fitting, and stable boot. Compression-molded EVA midsole with TPU inserts for supportive wear. Vibram XS Trek outsole with Impact Brake System and Frixion Blue rubber for superior traction. Last: Tempo2 Imported. Measurements: Weight: 1 lb 2 oz Shaft: 5 in Product measurements were taken using size 45.5 (US Mens 12), width D - Medium. Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.