When sourcing Melton wool, you must prioritize fabric weight, typically ranging from 300gsm to 800gsm. For heavy winter coats, a weight of 500gsm+ is standard. Ensure the wool content meets your requirements; while 100% wool is premium, blends with 10-20% nylon or polyester often enhance durability and abrasion resistance. Additionally, verify the finishing process, specifically the fulling and shearing techniques, which give Melton its characteristic wind-resistant, felt-like texture and prevent fraying.