The InTemp control system for Alpina Ruby 5 women's ski boots keeps your feet warm and toasty while you enjoy your day of skiing. Slip these Alpen Heat battery packs into your Alpina Ruby 5 ski boot and enjoy warmth all day long on the slopes. Specially designed for the Ruby 5 heated ski boot for women, these batteries last for up to 6 hours. The lithium ion batteries are fully rechargeable, and perform well in the coldest weather.
- 3 heat setting plus 1 boost setting
- High performance lithium ion batteries
- Recharges in 8 hours