CBD patches are very easy to use. Besides, the available CBD is absorbed by the body for at least 12 and a maximum of 36 hours! You'll no longer have to try to remember to take a new dose of CBD oil, all the while the CBD is delivered throughout the day. The high bioavailability of transdermal CBD ensures a high efficacy and great results with these topical patches. CBD topical patches by Simply CBD are transparent with a coloured grid, so they don't stand out.