BioWraps deliver direct and deep therapy when severe pain strikes for up to 24 hours after one 30-minute treatment.. Wearable compression electrode garment pairs with BioWave's high frequency neurostimulator (sold separately) to go deep into tissue and block pain.. Helps relieve acute, chronic, and post-operative pain on and around the knee. Size large/extra large fits knee circumferences of 15.5 to 19 inches.. FDA-cleared BioWaveGO sold separately.