La Sportiva Softflask 500ml track Patented Sock-Lock Technology to provide

Patented Sock-Lock Technology to provide targeted compression where it’s needed most

Perform with the power and comfort of ZQ-certified Merino wool in our Hike Light Cushion Crew socks—formerly known as PhD® Outdoor

Underfoot comfort stems from a full-length AMPLIFOAM™ PLUS midsole and GEL™ technology unit that's strategically placed where cushioning is needed

Compression straps cinch it all together for a compact carrying experience

La Sportiva Softflask 500ml track Patented Sock-Lock Technology to provideIdeal size for hydration vest, belt or pack pockets Soft material conforms to any pocket for comfortable carrying Flexible design shrinks as you drink reducing movement & packs away easily when empty Leak proof threaded design 42mm opening for easy filling and ice 100% BPA & PVC free Wide temperature range can be frozen max temp 80 degrees