Hit the trail running with a lightweight vest made for pace-pushing adventures. At the sweet spot between comfort and practicality, its ultra-light, breathable construction features wide, ergonomic shoulder straps and adjustment options at the chest and sides for optimal fit and reduced bounce. With more storage than its weight implies, it keeps all your essentials at hand with a hydration system sleeve and secure zippered back pocket, two soft flask holders (flasks included), and two quick-access drop-in pockets for your gels and powerbars. A little goes a long way with the Aenergy TR5. Features:- Adjustment options for optimal fit- Hydration system-compatible- Trekking pole carrier- Two soft flask holders- Lightweight constructionSpecifications:- Base material: 100% Polyester- Main material: 100% Polyester- Weight: 180 gActivities- Trail running: 6/6- Mountain training: 5/6- Hiking: 4/6Technology:PFC-free DWR:- Perfluorinated compounds (PFCs) are often used for waterproofing but are practically non-biodegradable. Mammut is committed to replacing non-biodegradable fabric treatments with more sustainable high-performance alternatives.100% decarbonized:- The CO2 emissions generated to produce this product were removed from the air, thus eliminating their contribution to climate change.