WoolX Merino Heavyweight Wool Baselayer Top 100% Australian Merino Wool Imported Flatlock non-chaffe seams, slight back drop hem and 3.5" cuffs 100 percent Australian Merino wool - 18.5Microns - 400g/M2 - Heavyweight Underarm gusset for comfort and mobility Keeps you warm in the coldest of temperatures - superior wicking (30 percent faster than synthetics) to keep you dry No shrinkage - washable and dryable - (turn inside out)