Mammut Massone Light Long-Sleeve Shirt

What Our Gearhead® Experts Are Saying:

"This is my go-to long sleeve for everything from bouldering sessions to shoulder-season hikes. The lightweight hemp blend is breathable, soft, and naturally odor-resistant, which is a huge plus on multi-day trips. The underarm gusset keeps it from riding up, so I stay comfortable whether I’m reaching for holds or trekking up switchbacks."

For days when the weather is cool but the adventure calls, the Mammut Massone Light Long-Sleeve Shirt keeps us comfortable from the crag to the coffee shop. Its breathable blend of hemp, recycled polyester, and lyocell offers natural odor resistance and moisture-wicking performance, making it a versatile piece for climbing sessions, hikes, and everyday wear.

Designed with movement in mind, this long sleeve features an underarm gusset for unrestricted motion, preventing it from riding up while we reach for the next hold or scramble up rocky trails. The contrast back seam adds a stylish touch, while the lightweight feel makes it easy to pack and layer. Whether we’re heading out for a day on the rocks or just embracing an active lifestyle, this long sleeve is built to keep up.

, Lightweight, breathable long sleeve for climbing, hiking, and casual wear, Hemp, recycled polyester, and lyocell blend for odor resistance and moisture-wicking performance, Underarm gusset enhances mobility and prevents ride-up during activity, Contrast back seam adds a stylish, modern touch, Regular fit offers comfort for layering or wearing on its own, Soft, eco-conscious fabric blend for comfort and sustainability