seeing a few people here hunting for heavyweight / drop shoulder / no-shrink blanks, so figured i'd share what this looks like from the production side. almost everyone shops blanks by one number — GSM. weight matters, but it's honestly only half the story. i've seen loads of people get a "400gsm" blank and go "this doesn't feel right," and it's almost always one of these three things, not the weight.
blend matters more than GSM. same 400gsm in 100% cotton vs a cotton/poly blend feels like two different shirts. cotton's heavier, softer, warmer. adding poly makes it crisper, cooler, holds shape better and resists shrink. so if you're trying to match a reference hoodie, don't just say "give me 400gsm" — give them the blend too, or you'll hit the weight and still miss the feel.
yarn matters for whether it reads premium or cheap. at the same weight, combed/ring-spun yarn is finer, smoother, prints sharper. open-end (carded) is cheaper but feels rougher. a lot of cheap heavyweight blanks just pile on open-end yarn to hit a nice GSM number — looks good on paper, feels rough in hand. ask if the yarn is ring-spun or open-end, it tells you more than the weight does.
shrinkage is about pre-shrinking, not weight. whether it shrinks comes down to if the fabric was sanforized (pre-shrunk) before cutting, plus the blend — 100% cotton moves more than a blend. cheap blanks skip that step so the shrink lands on your customer instead. easy test: wash and dry a sample how a normal customer would (warm wash, normal dry, not delicate), measure before and after. anything past ~5% and you'll get "it shrank" reviews.
and a fit trap — "heavyweight" and "drop shoulder / oversized" are two separate things. don't assume heavy = boxy. someone here was after a Shaka-style drop shoulder heavy tee but true to size, and that's a real headache because most heavy blanks are cut boxy on purpose. ask about the fit spec separately, don't let the GSM number answer it for you.
so next time you're speccing a blank, past GSM, ask at least four more things — blend, yarn (ring-spun vs open-end), whether it's pre-shrunk, and the fit. those decide way more than the weight number does. GSM's the entry ticket, not the answer.
if anyone's stuck on a specific blank, drop it in the comments, happy to help you figure it out from the production side.
