Why These Non-Elastic Diabetic Work Socks Are Ideal for Sensitive Feet. Construction, farming, security – loose top & thermal warmth. High-performance blend: 52% Polyester for strength & quick drying, 41.8% Acrylic for excellent thermal insulation & softness, 4.2% Mixed Fibres for added bulk & comfort, 2% Elastane for gentle shape retention without tightness.