Tog24 heat mens merino trousers the heat is a high performance base layer suitable for a wide range of outdoor activities although made from wool merino is very fine and stretchy and this makes for a very comfortable fit merino itself has very good natural wicking properties is warm very durable and naturally inhibits the growth of bacteria that cause the build up of odour a superb base layer which has to be worn to be believed quick drying fast wicking and breathable warmth without w