A tape ( 2 ) for securing an ultrasound probe to the skin comprises a sonolucent silicone gel ( 3, 4 ) for transmitting ultrasound from an ultrasound transducer to the body. A method of manufacturing an adhesive silicone product comprises a step of treating the adhesive composition or components of the composition to remove air or prevent the formation of air bubbles, in order to provide a sonolucent adhesive product.