Our trailers come with a fully insulated cab. The roof of the trailer uses Havelock Wool which offers an R-value of 4.3. The walls of the trailer are insulated with rigid foam board which offers an R-value of 3.8. The foam mattress on the floor of the cab offers considerable insulation and warmth. If you do a lot of cold season camping, we offer an option that includes insulated magnetic window covers that perfectly fit over all windows to further increase heat retention.