All hunters know the importance of being on the correct side of the wind and paying attention to changing thermals in the field, but how do we constantly monitor what is always changing? Problem solved. Trophy Blend's Vapor Trail is an industry leading scent-free wind detector that leaves a perfect, clump-free, Vapor Trail to ensure you are always on the correct side of the wind and thermals during your next stalk, trip to the stand, or calling set-up.