Arthritis Knee Sleeve XL by IMAK Foot Leg Lifters The spiral structure of the MSHQ 530914G The spiral structure of the Trioxon lining lifts moisture away from the skin and traps air within the lining to help prevent excessive perspiration Without O2 Inlet * Masks include a one way valve * Prevents mouth to mouth contact with victim's face * Facilitates a patient airway * Combines moderate head tilt jaw lift and opening of the mouth * More effective ventilation through mouth and nose simultaneously leakproof seal * * (Model 8040A): includes an oxygen inlet valve * Size: XL Fits a 21 23 Leg Circumference Measure 4 above center of knee cap * Tri band technology holds sleeve securely in place and helps prevent rolling