You''''''''re sure to find the style you need in our expanded line of surgeons'''''''' caps. Choose from six different materials: Polypropylene, Kaycel®, SMS, spunlace and rayon. Polypropylene is lightweight, breathable and fluid repellent. Kaycel® is a comfortable absorbent material. SMS is a three-layer design that is highly fluid resistant yet breathable. Spunlace and rayon are comfortable absorbent materials.