Synthetic Midweight Base Layer

The Burton Synthetic Midweight Base Layer is built for women who push hard on the mountain and want a foundation layer that keeps up — on the chairlift, on the run, and back at the lodge. At 230GSM, it sits in the sweet spot between warmth and packability, making it a go-to for cold days and high-output riding alike.

Constructed from a 92% recycled polyester and 8% spandex peached jersey, this mid-layer delivers true 360-degree stretch with a next-to-skin performance fit designed for unrestricted movement. HeiQ Smart Temp technology actively regulates body temperature as your effort level changes, while HeiQ Fresh keeps synthetic-fabric odor in check without relying on silver-based treatments. Chafe-free Softlock seams, a crotch gusset for mobility, and drop-in thigh pockets round out a thoughtful construction. It's also OEKO-TEX 100 certified and Bluesign® approved, and backed by a lifetime warranty.

This base layer suits riders who run warm, ski long days, or both — the active thermoregulation means you won't overheat on the hike-out or freeze on the traverse. The recycled fabric and silver-free odor tech make it a smart pick for anyone who cares about what goes into their gear. If you layer consistently and want a base that works as hard as your outerwear, this is it.

• Can I wear these off the mountain? Yes — the performance fit and clean look work equally well for après, travel, or everyday cold-weather wear.
• How does HeiQ Fresh control odor without silver? HeiQ Fresh uses a non-silver technology to interrupt the bacterial process that causes odor in synthetic fabrics, keeping the garment fresher for longer without the environmental concerns linked to silver-based treatments.