Kathmandu's therma PLUS tops are a popular choice for thermal underwear because of their balance of breathability & insulation. This proven performer in mountain environments ensures you stay warm & comfortable. therma PLUS long sleeve tops are designed with a slim fit to maximise their insulation performance & moisture management qualities. Outdoor enthusiasts appreciate the chafe-free flat seams & durable pill resistant finish. Match your therma PLUS Long Sleeve Top v 4 with a pair of Kathmandu leggings for all over warmth.