Offers ultra lightweight, H2Oproof, breathable Safe guardion, the Mountain Hardwear Stimulus Jacket for Boys utilizes zWeld construction Technology to deliver a shell weighting in at just 6 ounces. Built with Incite/Conduit 4-ways stretch, H2Oproof fabric and lined with Micro-Chamois polyester, the Stimulus is the ideal fast forward or emergency jacket, with 360 degree reflectivity and stuffing into its own pocket.