Mammut

Lenni Short-Sleeve Shirt - Men's

What Our Gearhead® Experts Are Saying:

"The Lenni Short-Sleeve Shirt is my go-to for warm-weather hikes and travel. The lightweight recycled polyester fabric dries fast, breathes well, and resists odors thanks to HeiQ Fresh technology—which is a lifesaver on multi-day treks. The UPF50+ sun protection is great for exposed trails, and the chest pocket keeps essentials handy. It’s easy to care for, packs small, and looks great whether I’m on the trail or exploring a new city."

When long trails and high temps call for performance, the Mammut Lenni Short-Sleeve Shirt is our go-to hiking essential. Made from 91% recycled polyester, this lightweight, quick-drying fabric keeps us cool and comfortable while reducing environmental impact. Treated with HeiQ Fresh odor control, it stays fresher for longer—ideal for multi-day hikes, road trips, or stashing in a pack for spontaneous adventure.

Designed for movement, the back pleat ensures extra comfort when wearing a pack, while the UPF50+ sun protection shields us from harsh rays on exposed trails. A buttoned chest pocket provides a secure spot for maps or passports, making this shirt just as functional for international travel as it is for backcountry treks. Whether summiting peaks or grabbing post-hike drinks, the Lenni Shirt is built to go anywhere.