150gsm merino short sleeve baselayer a light weight 100 merino wool baselayer in a loose fitting style this could easily be worn as a t shirt on its own merino wool is perhaps one of the best materials for a baselayer to be constructed from it is a natural material and can be used for most of the year during the cold winter months where it has excellent thermal properties but is also extremely breathable so great for spring and autumn high wicking odour resistant 150gsm loose fit