Matrix Style Link Professional Hold Booster Light Finish 30ml - FREEPOST. The Matrix Hold Booster is great for adding texture to your hair. Just a little bit goes a long way. This product adds a long lasting hold to any style whether that be short, long, curly or straight hair. Directions: In your hands mix a drop with another Style Link product. Add more if needed. Can also be layered on damp or dry hair. Matrix's Hold Booster is your Link to customizable extra hair hold. Unique concentrated formula adds instant hold to any style. A little goes a long way. Customizable hold that can be added to any hair styling products.