Inspired by desert mornings, impulsive Polaroid photos and late summer beach trips, Ibex's OD Heather is just a shade richer, a bit softer, and lot more natural feeling than other shirts. 18.5 micron fabric and curved seams are built in for maximum comfort. Made with Echo a superfine 18.5 micron New Zealand Merino wool. This is a super soft, quick drying, lightweight jersey fabric that outperforms synthetics and cotton in warm conditions. Wool's natural temperature regulating and moisture managing properties give you next to skin comfort year round. Use this fabric for warm weather tops and for baselayers in the cooler times of the year. Easy care, machine washable.