When sourcing Nylon-Polyester-Acrylic blends, you must prioritize the blend ratio (e.g., 30/40/30), as it dictates the final fabric's hand-feel and durability. Nylon provides elasticity and strength, Polyester ensures dimensional stability and wrinkle resistance, while Acrylic offers wool-like warmth and softness. Additionally, verify the Yarn Count (Nm or Ne) to ensure it matches your knitting or weaving machinery requirements, and check the Twist Per Inch (TPI) to balance pilling resistance with softness.