Ultralight backpackers and space-saving campers will love the Alpine 400 by Rab. Made from durable materials and hand-filled in the UK with 400 grams of responsibly sourced duck down, the sleeping bag provides all the warmth and comfort you need during spring and summer expeditions. A Trapezoid boxwall baffle construction maximises the down's ability to loft while reducing cold spots for comfortable warmth throughout. It uses a narrow mummy-shaped fit and angled footbox to ensure the pack size remains as light and compact as possible. When storing at home, use the provided cotton sack which will prevent the down from remaining tightly compressed for long periods and extend the performance of the sleeping bag.  Outer material: 20D Pertex Quantum nylon ripstop (36gsm) with fluorocarbon-free DWR (Durable Water Repellent)Insulation: 650 fill power R.D.S Certified European Duck Down with Nikwax fluorocarbon-free Hydrophobic FinishLining: 20D Recycled NylonWeight-saving chevron baffle designTrapezoidal boxwall construction - maximises loft and warmthYKK zipped internal stash pocketDown-filled neck collar - keeps the warmth inYKK 3/4 length main zip with down-filled baffle to trap warmthYKK Anti-snag zip insert and anti-snag internal zip guardAngled foot box for relaxed sleeping postureDrawcord stuff sack included for compact storage during transportZipped cotton sack with water-resistant base for safe storage at homeHand-filled in Derbyshire UKMaterial: Outer: 100% polyamide, Lining: 100% recycled polyamideTapered Mummy ShapeComfort limit: -1°C (30°F)Rab Sleep Limit: -5°C (25°F)Weight: 840g