The speed it's not stable in them because it depends on the person how much he weight, because when the person is a big weight so the speed will be faster because the sled has a lot of friction with the snow, but when the snow is too icy the speed will be faster about 35km/h. so if your kids are still learning how to slide so don't let your kids to sliding on the ice snow because will not control it. but in normal snow, the speed will not be faster and this is good for them to learn how to slide.