I use the NeoAir Xlite which is 25" wide. I find that I still need wings in the shoulder area. I use the Zlite pad (accordian type) which when cut in half is the perfect length for wings and doubles as a really nice sit pad. I believe the NeoAir and the Zlite still weigh less than my 20 degree UQ. I usually place the Neo Air between my double layer and the Zlite inside with me. I've had no condensation issues with it in that mode.