Rab merino 120 long sleeve tee the merino tm 120 long sleeve tee has been designed using a unique fusion of natural merino and synthetic fibres with 375 tm technology the super fine merino wool offers softness breathability and odour control complemented by the durability of the synthetic fibres and the fast dry times from 375 this intimate blend offers unsurpassed next to the skin performance a light weight workhorse for multi day use in milder conditions the merino tm 120 l