IsoFibre®

IsoFibre^® is an insulating fill made from 100% polyester, featuring specially engineered hollow fibers coated with silicone. This fiber structure traps warm air in internal air pockets, effectively enhancing thermal retention.

Upon unpacking a sleeping bag or insulated layer, the material rapidly decompresses and the fibers return to their original loft. This spring-like effect ensures the insulation regains its full shape and performance almost instantly.

Thanks to its lightweight, breathability, and quick-drying properties, IsoFibre^® is widely used in outdoor gear—especially in sleeping bags designed for 3-season or year-round use.