Hi-Brush (Badger effect) and S-brush (Hog bristle effect) are made from synthetic fibres (PBT), a thermoplastic semi-crystalline polyester. Both filaments are corrugated as to improve the perfomance of the brush in terms of holding and releasing the lather during the shave. Both filaments are chemically tapered to give a soft touch on the skin. Synthetic fibres are really much more performing than hog bristle and badger hair. They better withstand their daily duty and are much more hygienic and easier to clean.
