The Proton LT Hoody is equipped with a breathable insulation package to manage the dynamic needs of mountain pursuits and perform as a self-regulating mid layer for a variety of high output activities

and a hood that's slim enough to fit under a helmet for really chilly rides

Lightweight Freetouring Performance

that plush luxury includes our Freestyle Ankle Strap

We also added Dupont® Sorona® insulation for extra warmth

Fjallraven Abisko Mens Grid Fleece Hoodie 2026 Size:S The Proton LT Hoody isWarm hooded fleece sweater with a knitted outer layer and lofty grid structured inner for enhanced warmth and comfort. Made from recycled polyester, it is perfect as a fast drying, moisture wicking mid layer under a shell jacket or by itself on chilly summer evenings. Abisko Grid Fleece Hoodie for men has a snug hood and a full length, two way zipper. Versatile and packable, it is a must to have in your backpack for all kinds of hikes and outdoor