When sourcing 1 Ply blankets, the GSM (Grams per Square Meter) is the most critical indicator of quality and warmth. For a standard 1 Ply polyester or fleece blanket, a weight of 200-350 GSM is typical for lightweight use, while 400+ GSM indicates a high-density, premium product. Ensure the material is 100% polyester (Raschel or Flannel) to guarantee durability and resistance to shrinking. Additionally, check for anti-pilling and antistatic treatments, which are essential for user comfort and product longevity.