The Hot Chillys Kid's MTF Micro-Elite Original II Top is designed to act as the first level of warmth in a technical layering system. This long sleeve underwear top keeps a child's natural body warmth inside, but also releases excess heat when they're really active. The Hot Chillys Kid's MTF Micro-Elite Original II Top is a breathable thermal that wicks moisture away from the skin to keep your little one dry. | Hot Chillys Kids' Micro-Elite Original II Crewneck