Dri-Tac Dri-Tac Series is our most popular grip ever. Our WinnDry polymer material combines a comfortable feel with exceptional non-slip performance in all-weather conditions. Advanced Vertical Seam (AVS Technology) AVS is Winn's patented single-panel wrapping method. A sheet of polymer grip material encloses the under listing lengthwise, resulting in a vertical seam that seals the grip on the backside. AVS Technology features no overlap of materials and a virtually seamless appearance and feel!