The invention is directed to a macromer comprising unit derived from a siloxane diol, di-isocyanates and a diol comprising a pendant group comprising an oligomer or polymer derived from methyl oxazoline or ethyl oxazoline. The invention also relates to a process for the preparation of said macromers, and to that the use of said macromers. The macromers according to the invention may be used in lenses, such as ophthalmic lenses. Films comprising the macromers according to the invention provide a surprisingly low modulus in combination with a high water content and oxidative stability.