Traverse TvII Synthetic Sleeping Bag

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The Sea to Summit Traverse TvII is a three-season camping and backpacking sleeping bag. It features Thermolite synthetic insulation, WaveLoft construction, a tapered rectangular shape, and a Free-flow zipper system.

Sea to Summit says: 

The Thermolite-insulated Traverse offers unmatched versatility and room to move in a lightweight, technical sleeping bag. The Free-Flow zipper system, WaveLoft insulation construction and warmth retaining features give the Traverse true multiple-season flexibility.

The Traverse transitions easily into warmer weather with a full-length left-side zipper, a half-length right-side zipper, and a foot box zipper that provide unparalleled ventilation or allow the Traverse to be opened completely flat like a comforter. In colder weather, the unique WaveLoft construction allows the Thermolite insulation to expand out into air-trapping curves for maximum warmth.

Whatever the season, the wider mummy cut of the Traverse gives you room to move, no matter what position you sleep in.

Our Verdict

The Sea to Summit Traverse TvII is a versatile and roomy synthetic sleeping bag well-suited for three-season camping and backpacking. An EN comfort rating of 2°C provides cosy warmth on cool nights.

Thermolite synthetic insulation is used strategically throughout Sea to Summit’s unique WaveLoft construction, creating insulating air pockets that maximise loft and warmth. The tapered rectangular shape allows freedom of movement without excess dead air space.

What makes the Traverse TvII so versatile is its Free-flow zipper system. To regulate temperature, you can open the entire side zipper, half zip, or foot vent. In mild conditions, it lies fully flat as a blanket.

Other key features include a shaped hood, draft collar, waterproof, breathable shell, and hang loops for drying. Despite its spacious cut, the Traverse TvII still compresses down small.

– Reviewed by Ultralight Outdoor Gear

Features

• 30D DWR Nylon shell and 20D Nylon lining are lightweight and very compressible fabrics.
• Proprietary blend of THERMOLITE ® insulation using soft microfibres and fine Denier hollow- core fibres for lightweight  warmth and softness, with high loft and superior compressibility.
• Tapered rectangular shape for more space and comfort than a traditional mummy bag

Specifications

Temperature Rating

• EN13537:2012 Comfort: 2°C | 35°F
• EN13537:2012 Comfort Limit: -4°C | 25°F

Regular Specs

• Weight: 1172g (excludes storage bags)
  
• Fits up to: 6 ft / 185cm
• Internal Width Shoulder: 148cm
• Internal Width Waist: 148cm
• Internal Width Feet: 118cm
• Compressd Size: 18.5 x 27cm | 7.3L

Long Specs

• Weight: 1337g (excludes storage bags)
  
• Fits up to: 6 ft 6 in / 198 cm
• Internal Width Shoulder: 152cm
• Internal Width Waist: 152cm
• Internal Width Feet: 122cm
• Compressd Size: 21 x 23 cm | 7.3L

Materials & Construction

• Insulation: THERMOLITE
• Fabric: 30D DWR Nylon shell and 20D Nylon lining are lightweight and very compressible fabrics.
• Zipper: Free-Flow half right side, full length left side and separate foot zips.
• Baffle Construction: WaveLoft construction. Collar: Fitted front draft collar: scalloped over the neck and oversized at the shoulders.

Help & advice:

• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• Sea to Summit Sleeping Bag & Quilt Guide
• About Sea to Summit
• The EN13537 Standard
• All About Down