Another great hydration product from our friends at Hydrapak. The Wooly is fantastic at keeping our cold liquids cold – nothing more refreshing than a big gulp of ice cold water after an especially hot hike! You can thank the double-walls and the Primaloft insulation for this feature. This lightweight bottle has a ridge making it easy to hold and a nice big, leak-proof valve for drinking. Comes in 4 color combinations. Definitely a winner bottle!