Review on Arctic Hero 2 Pack Thermal Underwear Boys' Clothing for Underwear by Dwayne Pore

I bought the charcoal and dark blue set for my son who turned 4 last month. I bought a size 4 as one of the reviews says it fits her 4T boy. It fit my boy really well, wasn't too long. However, the quality does not seem very durable and thin. Charcoal material is stiffer than dark blue. I bought it because we're going on vacation to the Northwest, but I don't think so that it will keep my son as warm as I want. But I will keep it anyway because my son loves it.