Disclosed is a mono-functional silicone-containing monomer o the formula R3Si-O - [Si(R)(Z)O]a - [Si(R1)(R2)O]b -SiR3 or formula II wherein the substituents are as described within the specification. Further disclosed is a polymer comprising the reaction product of at least one monomer of formula II, a copolymer comprising the reaction product of least two monomers of formula II wherein at least one of said monomers has a different structure to at least one other monomer, and a copolymer comprising the reaction product of at least one monomer of formula II and at least one additional monomer. Also disclosed is a process for producing a silicone-containing monomer. Also disclosed is a silicone-hydrogel film comprising a polymer comprising the reaction product of at least one monomer of formula II, and a contact lens comprising said silicone-hydrogel film.
