Air mattress Burtovka with internal insulation. An 8 mm layer of PU foam is glued inside each tube, which prevents heat leakage. Suitable not only for summer hiking and cycling, but also for alpine hiking and climbing. The mattress can be inflated by mouth, with a manual or double-acting pump with a reduction, or a waterproof cover with a pump can be used. When inflating with a pump or bag, moist air from the lungs does not get into the mat, which insulates less and contains microorganisms and fungi.