When sourcing knitted ticking, the GSM (Grams per Square Meter) is the most critical indicator of quality; high-end mattresses typically require 250gsm to 500gsm for a plush feel and durability. You must also specify the yarn composition, such as polyester blends, viscose, bamboo, or Tencel, which affect breathability and moisture-wicking capabilities. Additionally, ensure the fabric has undergone anti-pilling treatments and possesses a high bursting strength to withstand the tension of mattress tufting and long-term use.