GildanUnisex Adult Fleece Crewneck Sweatshirt, Style G18000, Multipack

I'm 5'7 and weigh 180 lbs. Which size would fit me best?

I am a female, 170 pounds and I usually wear a large. If I get a medium will it shrink?

My dad has broad shoulders but short arms. large from other gildan product seems to fit him shoulder wise.. should i go with l?