Perfect like-new condition. Material has a subtle diamond-grid pattern and holds up incredibly well through wear and wash (only free-and-clear baby-safe detergent used). Says midweight, but honestly we used this mostly as a sun shirt from spring to fall. It breathes very well, so could be a sun shirt for warm weather or a base layer for cooler weather. From Patagonia site: Lightweight and versatile henley top made of 100% recycled polyester fabric with HeiQ® Mint odor control. Henley top with snapped placket Raglan sleeves for comfort and mobility Recycled Polyester Fabric: Made of 100% recycled polyester fabric with hollow-core yarns and a diamond-grid back for moisture-wicking warmth that dries quickly; with HeiQ® Mint odor control Low-Bulk Construction with Flatlock Seams: Forward-set flatlock seams for a great fit and to minimize chafing; low-bulk construction for easy layering under midlayers and outerwear Drop-Tail Hem: Drop-tail hem for extra coverage in back