KESTIN Mull Wool Blend Polo Dark Olive Fine. Designed as a simple yet smarter layering piece for cooler months, the Mull Polo is a long-sleeve style with a three-button placket. Knitted on a fine 14-gauge machine for a clean, tight construction, from a lightweight blend of 30% wool, 45% polyamide and 25% acrylic. Ribbed collar, cuffs and hem. Regular fit.