This is my second Sporthill XC jacket. The last one faithfully served me for over 15 years running in cold Wisconsin winters. Today was my first run in the Super XC jacket. I was out for 50 minutes of running in 28 degree weather. The XC was definitely warm / windproof enough, but the lack of arm pit zippers as a means to dump heat is a big fail. Please bring that feature back! Also, sizes run large. I'm 6'3, 215 with a 36 in sleeve, and large was fine for me. I drowned in the XL and returned it.