For The DonJoy Reaction Knee Undersleeve take the measurement of your thigh and calf 6″ above and below your kneecap using a flexible type tape measure. Use the circumference you measure here to choose your size.
Note: The DonJoy Reaction UnderSleeve runs small. If you measure between sizes we recommend going up one size for optimum comfort and fit
| Size | Thigh |
| XS/S | 13.5″ – 18 .5″ (39-47 cm) |
| M | 18.5″ – 21″ (47-53 cm) |
| L | 21″ – 23.5″ (53-60 cm) |
| XL | 23.5″ – 26.5″ (60-67 cm) |
| XXL | 26.5″ – 29.5″ (67-75 cm) |
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