When sourcing cotton zip hoodies, the fabric weight (GSM - Grams per Square Meter) is the primary indicator of quality; for premium streetwear, look for 300-400 GSM, while lightweight promotional items typically range from 200-250 GSM. Ensure the material is 100% Combed Cotton for superior softness and low pilling, or a Cotton-Polyester blend (e.g., 80/20) if you require better shape retention and wrinkle resistance. Always verify the fleece lining type, such as Brushed Fleece for warmth or French Terry for a lighter, breathable feel.