Boys' thermoactive brushed underwear. The fitted T-shirt is made of stretchy knitted fabric with a brushed interior. Fibres with 4FWarm technology will keep your child comfortable during autumn and winter activities. In addition, we used the quick-drying 4FDry technology, which is responsible for efficient moisture management. The T-shirt features a high turtleneck with an insert of breathable material. It will shield the neck and face while allowing your kid to breathe freely.