Soft, lightweight, and with proven protection from mosquitoes, the Royal Robbins Amp Lite II men's long-sleeved shirt is ready for basecamp inspired adventures. With back pleats, side slits, and underarm gussets for added mobility, this shirt is great for hiking, biking, and paddling. Mosquito Protection Technology™ provides highly effective and durable protection from mosquito bites. Also, design features offer additional mosquito protection: an adjustable two-button cuff and a fold-up collar with a button closure for neck coverage.