The ultimate packable ultralight is two insulated vests in one. Windproof Pertex® ripstop polyester shell and lining. Reversible design lets you choose from two contrasting colors. PrimaLoft® Gold insulation is highly compressible, and vest packs down into interior chest pocket for easy transport. The "action side" has a single chest pocket but no hand pockets because these would be inaccessible when wearing a pack with hip belt. Reducing the pockets on this side also helps keep overall weight to a minimum and ensures exceptional, low-bulk packability.