SCARPA Size Chart Maximizing support, breathability and protection while minimizing weight, the modern and athletic Hydrogen GTX is a nimble, all-conditions trail shoe. It features the lateral support of TPU reinforcements and the ultra-breathable weather protection of GORE-TEX(R) Surround(R) Technology. Features: - 321g; 11.3oz (1/2 pair size 38) - Synthetic Nubuck & Mesh Upper - Waterproof GORE-TEX(R) Surround(R) Technology - EVA-CM Midsole - Vibram(R) Salix / XS Trek Outsole - P-Flex Lite Spacer Insole - Low Cuff Height - MST Last - Partial Rand