Pack Trek Cap. A trekking cap with an extra-long visor to offer an even greater protection from the sun. Comfortable, breathable and stretchable, it is a stylish proposal for sun protection during hikes and mountain treks in good weather. Easy to pack and carry thanks to the ultimate packable technology. Designed for the high performance accessories seeker, the pack concept by BUFF is the base of our most technical caps and visors. Developed in our design labs and fully tested by top BUFF ambassadors, our packable designs can be folded inside a hand, twisted and packed into the smallest pocket without losing its shape once released.