DESC: After a long day of hiking along cold, damp trails, unroll the Marmot Trestles 15 Sleeping Bag and snuggle in for some well-deserved rest. This reliable, all-purpose bag is packed with Spirafil 120 insulation that blends three-denier spiral hollow fibers for loft and one-denier polyester fiber for warmth, softness, and compressibility so you stay warm in the dankest conditions. The Trestles 15's Wave construction combines the advantages of both traditional blanket and shingle construction to eliminate cold spots without adding a lot of extra weight to your pack.