100% Peruvian pima cotton; 3-button placket with Dura-pearl trademark buttons; additional yarn in collar and cuffs for neater appearance and durability as well as stretch tape in shoulders for added strength. Authentic Peruvian pima cotton only found in the Andes Mountains of Peru where it has been passionately developed for centuries. The unique climate of this region has been noted to produce remarkably longer, finer and stronger fibers than any other cotton region on earth. Available in 3XL and 4XL, but in limited quantities.