Senna Jersey is Gramicci"s Natural Performance Technology fabric that is pesticide and herbicide free durable hemp and certified organic cotton; a base layer with double traverse stitch that regulates body temparature, fast wicking and drying. * Shoulder stitch detailing, Backpacker shoulder seams are placed forward eliminating chafe and discomfort, Longer curved hem eliminates riding up while backpacking or climbing * Fit: Dream, slim fit, close to body, fitted shape.