Check the listing for details. LS2 Stream II America Helmet. Color: Matte Gray/Black, Condition: New with tags. Listed at 169.98 USD. It's hard to imagine just how good the LS2 Stream II full-face motorcycle helmet is. Style, features and performance that surpass helmets costing literally twice the price, this helmet is an out-of-the-park home run. It starts with an aerodynamic, sport styled shell made from LS2's proprietary Kinetic Polymer Alloy (KPA). This high-tech material uses nanotechnology to blend microscopic aramid fibers with a high-end polymer. This blend allows for amazing energy managing performance with managed flexibility that absorbs energy without the ricochet effect of inferior materials. The Stream II meets the ECE 22.06 rotational energy management specifications using Advanced Rotational Energy Management Technology (AREM), another LS2 proprietary process. The rear spoiler allows for dynamic.