Supports Patient's Head during prolonged surgeries (air and gel cushioning ). Protect Skull, Neck & Ears in multiple positions by conforming to head's contour. Available in below sizes : Item Size Dimensions (mm) OHR-N Neonantal 90 x 45 x 20 OHR-M Medium 150 x 80 x 30 OHR-L Large 200 x 100 x 40