I own a Sugoi wool jersey. It is on the thick side, but is comfy in a wide range of temps. With arm warmers (if short-sleeved) mine are comfy from high 30's to mid 60's. With a rain/wind jacket it's good down to low 30's or below. I don't baby mine at all, as far as care. I wash them like normal clothes and have experienced no shrinkage, but I don't wash anything on 'Hot'. If you care about it getting pilly, be sure to turn it inside-out.