Sirocco Junior Smock The Sirocco Junior Smock is built using an extremely durable, waterproof and breathable 2.5 layer fabric construction. Sleeve design limits ride-up and improves freedom of movement. Features A neoprene hem with twin side adjusters ensures a tight and comfortable fit Fully Adjustable PU neck and wrist closures keep water out Hook and loop neck closure system makes it easy to open up for venting PU cuffs to create a watertight seal