Winter Mummy Sleeping Bag

• Fill: synthetic hollow-fibre (polyester microfibre) that keeps its loft when damp
• Shell: 400T ripstop nylon, water-repellent and tear-resistant, with a soft 380T polyester lining
• 11 fill weights from 400g to 3000g, spanning roughly +20°C to around -25°C (manufacturer guidance, not EN 13537 certified)
• Dimensions: 210 × 80 × 50 cm, total weight 1.1 to 3.6 kg depending on fill (±5%)
• Two-way zip, anti-slip velcro collar and adjustable hood drawcord
• Inner pocket, foot-end hanging loops and an included compression sack; green or blue
• Dispatched after 3 to 5 business days of processing, delivered within 10 to 20 business days

Synthetic fill, chosen on purpose

The Winter Mummy Sleeping Bag runs a synthetic hollow-fibre fill instead of down, and that is a deliberate call for damp British conditions. Synthetic keeps its loft and much of its warmth when it picks up moisture, exactly where untreated down collapses. You pick from 11 fill weights, 400g to 3000g, spanning roughly +20°C for summer bivvies down to around -25°C for hard winter nights. These are manufacturer figures rather than EN 13537 certified, so aim at the comfort end of your chosen weight and treat the coldest numbers as a hard limit.

Built for real winter camping

The mummy cut and anatomical hood trap heat at the neck and head, while a two-way zip lets you vent from top or bottom without losing the bag's shape. The 400T ripstop nylon shell is water-repellent and tear-resistant, the lining is soft 380T polyester, and details like an inner pocket, foot-end hanging loops and an anti-slip collar earn their keep. Internal size is 210 by 80 by 50 cm, with total weight from 1.1 to 3.6 kg depending on fill. It packs into the included compression sack.