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Ultra-lightweight, the Ultimate Direction Ultra Undershirt 5.0 has been made with a four-way stretch nylon-elastane fabric with dissolved thread for increased movement and breathability. Shoulder strap shaping and hook and loop adjustability also allows an equal distribution of weight and a comfortable fit, while ample storage at the front and back lets you carry up to a 3.0L reservoir, valuables and energy snacks. Additionally, a whistle and trekking pole holders are perfect for those who like to change up where they run and corded elastic lets you stash your gear and offers compression to reduce bulk. To finish, Ultimate Direction have included two of its Body Bottle™ II bottles.
Small: 58 - 81 cm / 23 - 32 in
Medium: 76 - 99 cm / 30 - 39 in
Large: 94 - 117 cm / 37 - 46 in