Perfect outdoor solution for active parents. The item quickly sets up as a bike trailer and can be quickly converted to a two-child swivel wheel stroller. 16" rear wheels deliver low rolling resistance, with large front and side windows. The AS2 trailer includes a foot bar that protects your children's feet, and also comes with a removable three season bug and rain shield. The padded five-point safety harnesses securely holds your children in place during use. A universal coupler secures to your bicycle's rear axle and makes installation and removal from your bicycle a snap. Does not include safety flag. Color is black and lime green. All Allen trailers pass the required ASTM safety standards.