Schuberth S3 Custom Fit Helmet Liner Change the fit of the Schuberth S3 helmet from intermediate oval, to either oval head or round head with this pad kit. Round Head Sizing: MD: Side Pads 10mm / Rear Pads 17mm LG: Side Pads 7mm / Rear Pads 15mm XL: Side Pads 12mm / Rear Pads 17mm Oval Head Sizing: MD: Side Pads 17mm / Rear Pads 10mm LG: Side Pads 15mm / Rear Pads 7mm XL: Side Pads 17mm / Rear Pads 12mm Standard Sizing Included with Helmet: MD: Side Pads 15mm / Rear Pads 15mm LG: Side Pads 10mm / Rear Pads 10mm XL: Side Pads 15mm / Rear Pads 15mm