What Our Gearhead(R) Experts Are Saying:"I started using the TWIST Thermo Sleeve on long summer rides and the difference in drink temperature by the end of a hot climb is noticeable. It slides on and zips up in seconds and the TWIST mechanism still works perfectly through the sleeve without any extra fiddling."Summer riding has a way of turning a cold bottle lukewarm before the first climb is done, and the FIDLOCK TWIST Thermo Sleeve exists to change that. Designed to slip over any compatible TWIST bottle in the 450ml, 590ml, or 600ml range, it zips closed in seconds and keeps drinks insulated through long hot efforts without adding any meaningful bulk or weight to the setup. The sleeve is built from flexible chloroprene rubber with an offset recessed grip that stays secure in a sweaty hand or a cage mount regardless of conditions. The precision-fitted TWIST connector recess is the key detail here, maintaining full compatibility with the magnetic TWIST mounting system so the bottle snaps on and releases exactly as it would without the sleeve in place. Cold drinks stay cold and the whole system keeps working the way it was designed to.