The popular Aspen has a 1000 denier, waterproof breathable outer, it has a heavyweight 350gsm polyfill with breathable nylon lining. Double chest straps, cross-over surcingles, legstraps, fixed neck cover with easy and quick loop through elastic/touch tape fastenings and strengthened surcingle guides. a
A great value, warm, snug rug for keeping the elements at bay. 
Taped seams
Ripstop
Waxed stitching
Breathable
Waterproof
1000 Denier
350gsm Polyfill
Heavyweight