Constructed from a 200 denier nylon exterior and velcro receivable fleece interior surrounding 1/2" closed-cell foam. They offer a tight fit inside the bags for which they are offered. All liners have a zippered top, buckles on each end for compression, handles, and velcro-receivable inner walls designed to work with the Ocoee Divider set. Work perfectly with HD cameras, video cameras, as well as digital SLRs.  Divider set sold separately.