The La Sportiva Bristen Thermal Hoodie is built on TechStretch Storm, a patented single-layer fabric that fuses softshell wind protection with fleece warmth instead of asking for both separately. That construction blocks wind and holds body heat through cold, technical days, while a helmet-compatible hood and harness-friendly hand pockets keep it working through an actual mountaineering objective, not just a cold walk. Pre-shaped elbows and elastic wrist cuffs round out the fit for full arm movement in the cold. What Our Gearhead(R) Experts Are Saying:"I zipped this up for a windy alpine start with a helmet and harness already on, and never had to layer anything else over it until the sun came up. One piece doing a softshell's job and a fleece's job at once is the difference between packing light and packing heavy."