Sea to Summit Traverse Tviii

Technologies and manufacturing processes

• WAVELOFT CONSTRUCTION

  WaveLoft is a unique construction technology that maximizes loft and minimizes the weight of the insulation. Instead of conventional flat insulation layers (sewn flat on top of each other) or shingled layers (sewn diagonally overlapping), WaveLoft creates curved layers that expand from the shell to trap the maximum amount of air, at a lower overall weight than existing synthetic insulation constructions. WaveLoft is used in all Sea to Summit synthetic insulated sleeping bags, regardless of price point.

• THERMOLITE HL-1

  Thermolite HL-1 is part of the family of Thermolite materials used in Sea to Summit sleeping bags, sleeping bag liners and sleeping mats. HL-1 high-loft insulation is a fiberfill constructed with a unique 3D crimp of hollow-core and solid fibers that provides excellent, lightweight warmth with superior durability. Thermolite insulation molds into the air-sprung cells of our sleeping mats, preventing convective heat loss from your warm body to the cold ground.

• ZIPPER COUPLING

  Down and synthetic bags marked with our zipper symbol feature a 65-inch #5 full-length YKK zipper that allows a unisex, left-handed bag and a women's-specific, right-handed bag to be joined together. This allows each person to sleep in their own sleeping bag and take advantage of the unique insulation zones, hood and foot box - perfect for cozy adventures for two. Sleeping bags with full-length #5 YKK zippers on both sides can also be connected to other sleeping bags.

• FREE FLOW ZIP

  Our free-flow construction with three zippers ensures that your sleeping bag offers maximum warmth and efficiency when needed and multiple ventilation options when required. The half zipper on the right side of the sleeping bag (left side for women) provides freedom of movement for both arms, additional ventilation and allows the top third of the sleeping bag to be folded down as a mini quilt when the mercury rises higher than expected.