Lives at 1800 m throughout the year with my girlfriend, it is very cautious: Nothing helped: the electric auxiliary heating, the hot water bottle at the foot of the bed, she spent the first hour in bed to shake cold !!! is seeking all the extra heating solutions there may be on Amazon I came across this heated mattress ultra simple to use, it heats relatively quickly (1/4 hour on the position 3 to be ideal) and allows to heat only part of the bed (1 place!) very pleasant when her boyfriend is sleeping without duvet !! She uses it almost every day since Christmas and it still works: in short, a very good product !! this is the best gift she had for 7 years!
