Insulation traps a layer of air between you and your surroundings. Duck down is used as the premium fill – those tiny filaments trap a lot of air. Having no quill down has little ‘body’ and is often reinforced by the addition of feathers. It is very susceptible to water and loses its insulation properties if wet. Not only does water rapidly draw heat away from the body but it also stops down’s ability to loft – the drawing in of that insulating layer of trapped air which makes it expand from its compressed state. And some campers have a down allergy. Sleeping bags store down in chambers that allow an even spread and stops it migrating to one area.
At Easy Camp we use hollow fibre synthetic fills for they are far more user-friendly and do not carry the down’s premium price. This captures air in tiny tunnels that run the length of each filament.
Synthetic sleeping bags do have a size and weight penalty but this is not a problem unless camping in more extreme conditions that demand low size/weight with superior performance. Premium synthetic fills have good insulation values and a longer life than cheap fills that rapidly lose their ability to loft and trap air. Synthetic fills are also easier to maintain than down and do not lose as much insulation properties when wet – making them the better choice for family campers.
Layers of synthetic sheets are used. Single layer bag, as used in our Chakra, Astro, Cosmos and Moon ranges are good for summer conditions, or for travel, or sleep-overs but cold spots can occur where the sheets are compressed by the stitching used to attach the layer to the sleeping bag’s outer/inner face.
Our double layered bags, like the Nebula and Orbit ranges, avoid this problem by having two layers of insulation; one sewn to the outer fabric and one to the inner fabric. The layers are offset to cover the cooler compressed stitching areas, making the sleeping bag more suitable for general use throughout the year.