Biotack TdeT reins have excellent grip, great comfort and extreme flexibility. Open loop system for simplified, seamless assembly. The qualities of leather combined with the ease of synthetic: no more chores of greasing leather, a simple stroke under the water jet or in the washing machine and your hunting collar comes out like new. Open loop system for simplified, seamless assembly. Biotack: patent registered by TdeT: the same soft touch as leather, the same profile, the same color! Brass buckles.