What Our Gearhead(R) Experts Are Saying: "I've used this piece on spring tours and cold trail runs-it's super breathable and moves well thanks to the fleece side panels. The recycled rope insulation is surprisingly warm and compressible, and I love the way the baffles are designed to cut out cold spots without bulk." We throw on the Mammut Sender IN Hybrid Jacket when we need just the right mix of warmth and movement for high-output days in the mountains. Whether we're layering under a shell for a skintrack push or wearing it solo on breezy fall hikes, this hybrid design keeps us warm without holding us back. The insulation is made from Mammut's LOOPINSULATION-an innovative synthetic fill created from recycled climbing rope offcuts-delivering eco-conscious warmth in a lightweight, low-bulk package. The brick-lay baffle pattern eliminates cold spots without adding extra seams, while stretch fleece panels on the sides and sleeves keep our range of motion unrestricted and our body temp dialed. Add in a recycled wind-resistant face fabric and a storm flap behind the main zip, and the Sender is the layer we grab when conditions call for active comfort and technical versatility.