A beige Mammut rain jacket with a hood, surrounded by colorful, fluffy, cloud-like shapes, perfect for outdoor adventures.

Mammut
LOOPINSULATION

Next-level insulation with lower impact – transforming rope offcuts and recycled materials into cutting-edge cold weather protection.

Warm even in wet and humid conditions, crafted from repurposed materials, and easy to care for, Mammut LOOPINSULATION marks the next step in our journey toward creating more circular products. Made by transforming industrial rope production offcuts and recycled PET (rPET) into next-level insulation, our jackets are ready for quick day hikes and multi-day tours alike.


Process

  • Collecting rope offcuts

    Polyester-based rope offcuts from industrial rope production are gathered – materials that would otherwise be discarded.

    Tangled colorful Mammut climbing ropes in various patterns and colors against a light background.

  • Transforming materials

    These offcuts are then untangled into single strands which are brushed together and combined with recycled plastic.

    Hands crafting a blue Mammut mountaineering jacket, featuring fabric and stuffing, with scissors and a ruler in the background.

  • Creating insulation

    The end result is fluffy polyester sheet padding and cluster fill, which creates warming insulation for our jackets.

    A person examining the inside padding of a quilted Mammut jacket on a table, with fluffy down stuffing visible.

Designed for

    Designed for

  • A hiker in a blue Mammut jacket ascends a rocky, misty mountain trail, with fellow hikers visible in the background.
  • A person in a Mammut purple jacket smiles with arms crossed, leaning against large boulders in an outdoor mountain setting.
  • Adventurer in a teal Mammut jacket balancing on rocks beside a misty alpine lake, mountains rising in the background.

    

How the technology works

At Mammut, we're always exploring more sustainable and resourceful practices. When we tested reused rope for insulation, we found that while climbing ropes made from polyamide weren't effective, rope production offcuts made from polyester had fantastic insulating properties – and from this, we developed Mammut LOOPINSULATION.

Close-up of Mammut beige wool fabric showcasing its soft texture and natural wrinkles, ideal for high-performance sports and mountaineering gear.

Industrial rope offcuts undergo a mechanical recycling process. These ropes are untwisted into single rope strands, which are then brushed together and combined with rPET at a 50/50 ratior ecycled plastic to create polyester sheets or clusters – using no extra chemicals, glues or water.

These polyester sheets or fiber balls are placed with great care inside our jackets to form synthetic insulation for warmth and protection against cold and wind. The result is next-level insulation with a lower environmental impact. The production of Mammut LOOPINSULATION emits 48% less carbon compared to standard virgin polyester insulation. This calculation considers the emissions of shipping the material from Europe to the garment manufacturers in Asia for production.*

* Attribution statement: The estimations regarding CO2 calculations were modelled using the Higg MSI 3.7. They were calculated by Mammut Sports Group AG and are not third-party verified.

Mammut LOOPINSULATION