These kids' fleece thermal pants might be very light and soft, but they are a powerhouse of warmth! Hot Chilly's uses micro-denier polyester yarns to make these children's thermal pants feel super warm without being too thick and bulky. These heavyweight base layer bottoms are brushed with an anti-pill finish on the face to keep it looking nice, and Moisture Transfer Fibers to make sure the fabric stays dry. These are sure to keep the kiddos warm, dry and super comfy so everyone can have fun!