Polar fleece lining, hidden polar fleece inner layer for more thickness, and a polar fleece or cotton outer.  The all-polar hammocks are thick enough to be used as a Bumble pad/cage flooring for Chins and Piggie cages.

These hammocks have been made for me by "The Fuzzbutt Ladies", skilled seamstresses who are sewing some of my gear for me. They are to the exact same standard, thickness and quality as the gear I sew myself - I'd not put the Fuzzbutt name on them otherwise ;)

Measures 20x15".  See the Fuzzy Gallery for customer photos or see the product comparison page for some helpful info.