Sea To Summit Spark SpIII Sleeping Bag (Regular) Ultra-light and technical, this Spark Series bag is designed to keep you as warm as possible whilst also minimising packed weight and size. Utilising a combination of premium materials, and an especially carefully designed construction, the Spark SpIII Sleeping Bag is warm and cosy with superior performance. The bag is made from RDS 850+ Loft Premium Goose Down, which is the very best quality down made available for sleeping bags. This, therefore, will provide you with the highest weight ratio insulation, and is long-lasting for all of your upcoming adventures. The ULTRA-DRY Down protection included in the sleeping bag will protect the down from external moisture and condensation, therefore eliminating the negative effect that moisture has on down. This will ensure you remain dry, thanks to the water-repellent properties, keeping you covered in light rain. Additionally, the fabric has anti-bacterial and anti-microbial t