Sea to Summit Trailhead ThIII Long midnight/cobalt

A three-season synthetic sleeping bag with the flexibility to run as a quilt when conditions allow.

The Sea to Summit Trailhead ThIII Long uses WaveLoft polyester insulation in a tapered-rectangular mummy cut, delivering a -7°C comfort rating with enough interior room to accommodate varied sleeping positions. The DWR-treated 30D nylon shell handles light moisture, while the full-length YKK® #5 zipper runs through the foot box for progressive ventilation or full flat opening as a quilt.

Features

• WaveLoft synthetic insulation — polyester fill shaped into air-trapping curves for efficient heat retention
• Full-length YKK® #5 zipper extends through the foot box; opens flat for quilt configuration
• 30D nylon shell with DWR treatment for moisture resistance
• 20D nylon liner fabric
• Oversized draft tubes over zippers to minimise heat loss
• Includes stuff sack

Technical Specifications

• Comfort temperature: -7°C
• Shell: 30D nylon with DWR treatment
• Lining: 20D nylon
• Insulation: Polyester (WaveLoft construction)
• Shape: Mummy (tapered-rectangular cut)
• Body length: 192 cm
• Shoulder circumference: 162 cm
• Hip circumference: 157 cm
• Foot circumference: 108 cm
• Weight: 1.53 kg