From the manufacturer

The new TWIST water bottle thermo sleeve provides optimum insulation for chilled drinks. Perfect for hot summer days on the bike. Simply slide the TWIST bottle into the TWIST thermo sleeve, close the zipper and get started. The precisely fitting TWIST connector recess guarantees optimal function of the TWIST mechanism. The offset recessed grip combined with the flexible chloroprene rubber material fits perfectly and offers grip in every situation. The TWIST thermo sleeves are available for TWIST bottles with volumes of 450ml, 590ml and 600ml.

Features

• Reliably keeps drinks warm or cold
• Precise TWISTing thanks to the perfect fit
• Zipper for easy handling