Mammut continues to scale its recycled LOOPINSULATION platform with the launch of LOOPINSULATION Active: a new insulation technology made from industrial rope production offcuts and recycled polyester, designed to reduce material waste and support lower CO2 impact while delivering the performance required in the mountains.
Every year, high-quality rope offcuts are generated during industrial production. Instead of treating this material as waste, Mammut gives it a second life as functional insulation. Combined with recycled polyester (rPET), LOOPINSULATION Active transforms surplus material into an adaptive insulation structure engineered for high-output mountain sports.
Designed with an accordion-like structure that regulates heat, LOOPINSULATION Active responds to changing levels of activity: trapping warmth when you stop, and releasing excess heat and moisture as you move. The result is insulation that regulates your microclimate in real time, from intense ascents to exposed ridgelines. Like all LOOPINSULATION technologies, it is built on circular material innovation: keeping existing materials in use for longer, reducing dependency on virgin resources, and turning Mammut’s rope-making heritage into a tangible step toward lower-impact alpine performance.
The process gives unused rope fibres a second life and helps avoid the need for newly produced insulation fibres. In 2025, Mammut repurposed 13.4 tons of industrial rope waste through this approach. By combining recycled rope fibres with recycled polyester, Mammut reduces waste, keeps valuable materials in circulation, and supports CO2 savings compared with conventional insulation approaches based on virgin materials.
Lightweight, breathable and reliable even in wet conditions, LOOPINSULATION delivers warmth across changing mountain environments, showing that recycled materials can meet the functional expectations of modern mountain sports.
LOOPINSULATION is created through a mechanical recycling process that keeps materials in use while maintaining performance. Industrial rope offcuts are collected from production partners, and then the ropes are untwisted and brushed into individual fibres. These are mechanically shredded and felted into insulation without added chemicals, glues or water.
The rope fibres are then combined with recycled polyester from PET bottles. The insulation consists of 50% recycled rope fibres and 50% recycled polyester, with the material used as padding and cluster fill across Mammut products.
FW26/27 Highlighted products
Aenergy Air IN Hooded Jacket Men
A lightweight insulation layer for high-output activities. It breathes and stretches during movement while locking in warmth when you stop.
Aenergy Air IN Hybrid Shorts Women
Designed for fast ski touring, these shorts provide targeted warmth over softshell pants. LOOPINSULATION Active ensures breathability on the ascent and insulation on the descent.
Sender IN Hooded Jacket Women
A cold-weather layer featuring LOOPINSULATION. It delivers warmth and protection in sub-zero conditions while advancing circular design.
Sender Moc Low Women
Designed for life beyond the trail. Featuring a winter-specific outsole for grip on frosty terrain, this water-resistant shoe integrates LOOPINSULATION to lock in warmth. A microfleece lining enhances comfort in cold conditions, while lightweight EVA cushioning and an Ortholite insole support recovery and everyday wear.
