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Insect BlockerĀ® baselayer is a revolutionary new defense in the battle against bugs. This technology provides effective, built-in, invisible and odorless protection against a variety of biting insects. Baselayer eliminates annoyance with close-fitting designs and flatlock stitching to reduce chaffing during vigorous activity. Insect Blocker baselayer keeps mosquitoes, ticks and other biting insects at bay, letting you enjoy the outdoors in peace.