T-shirt
made
from
regenerated
nylon

Forest panorama

Make the difference.

Close The Loop – Join in and help Mammut make mountaineering more sustainable with a T-shirt we’ve made entirely from reprocessed waste. The Close The Loop functional T-shirt is 100% ECONYL® regenerated nylon. Some of the material comes from old climbing ropes collected by Mammut at select climbing gyms and stores. The Close The Loop T-shirt is lightweight, functional and perfect for outdoor activities all year round. It dries in no time and has a 3D material structure that makes it extra comfortable on your skin. Offset seams prevent uncomfortable pressure when carrying a backpack. To reduce unpleasant odors, the T-shirt is treated with HeiQ Pure technology developed in Switzerland. This helps conserve resources since less washing is required. And because it’s made of 100% regenerated nylon, the material can be reused over and over again – closing the loop. The T-shirt was developed by Mammut in collaboration with the non-profit organization Protect Our Winters Switzerland.

A special treatment is applied to prevent unpleasant odors. As a result, fewer washing machine loads means you save resources.

Close the Loop

Support us in reducing Mammut's carbon footprint. Together we can give new life to climbing ropes!


Lightweight, technical and robust. The T-shirt that makes the difference and gives you the technical support you need in your activities.

Help us to make mountaineering more sustainable with the Close The Loop T-shirt. By using 100 % regenerated nylon, we can reuse all of it — closing the loop.

Mann in Close the Loop T-shirt