750GSM single weave cotton is deliberately heavier than a BJJ gi's pearl weave — judo's gripping and throwing demands need a jacket that won't tear at the collar under sustained collar-and-sleeve control, which is exactly where IJF inspectors check for wear during tournament weigh-ins.
Judo clubs preparing students for IJF-sanctioned competition are the main buyers of the tournament-grade spec, while training-only clubs sometimes order a lighter weight for daily practice to reduce cost.
Pre-shrunk single weave still benefits from cold washing and air drying — the collar reinforcement stitching is the first place shrinkage-related tension shows up if a gi is repeatedly hot-dried.