You can also choose between two positions: high pressure and large volume

The advanced textiles in YAK FLOW™™ are tuned to allow a precise amount of air permeability

and ISO 18527-1

for trekking and hiking

giving you optimum temperate control whether trekking in the backcountry or skiing on the pistes in deepest winter

oakley flak xs matte white prizm sapphire 0oj9005 16 7840006112669 Sci|Sci Professionali You can also choose betweenOakley Flak Xs Matte White W Prizm Sapphire. Specially engineered for youth faces, Flak XS features the same innovations that athletes have grown to expect from the Flak family. FEATURES Lightweight O Matter frame material with ellipse metal icon accents Unobtainium earsocks and nosepads for increased comfort and performance Polarized and Iridium lens options available Interchangeable lens system Available with Oakley Authentic Prescription Lenses