Altra Women's Olympus 5 Hike Low Gore-Tex - UK 5.5 Grey/Black - Shoes. The Altra Women's Olympus 5 Hike Low Gore-Tex Shoes boast a contemporary design fine-tuned for hiking comfort. Made with a waterproof, windproof, and breathable Gore-Tex membrane, feet will remain dry and cool all day long, while the premium collar provides a locked-in feel alongside the Altra original FootShape fit to give your feet the room they need for natural movement. Support and max cushioning is also provided by a compression moulded EVA midsole and Innerflex grid-like grooves to keep your feet feeling lighter for enhanced speed and performance. Additionally, the grippy Vibram Megagrip outsole helps you with traction on every surface, wet or dry.