Pack Cap Kids The ultra-light Pack Cap Kids from BUFF® is ideal for hot summer days thanks to the UPF 50+. The kids cap is breathable, quick-drying and comes with an integrated sweatband. It can be easily folded up without losing its original shape. Can be packed small and keeps its shape. Advanced technology, designed for your comfort, foldable in your hand and keeps its shape when unpacked. Fastwick Extra+ technology: knitted polyester textiles form a special honeycomb structure with highly breathable properties. Fast drying ensures that comfort remains during intensive activities. Integrated inner band for sweat and moisture dissipation. Specially developed for children: these designs, sizes and technology focus on the comfort and protection of the youngest.