{TAIL ~ A water insoluble hydrophilic gel} comprising: about 30 to about 90% of a hydrophilic polymer of identical or different watersoluble mono olefinic monomers, or copolymer of said watersoluble monomers with 1 to 70% of water insoluble, identical or different mono olefinic monomers, {HEAD ~ which polymer} or copolymer is cross linked with about 10 to about 70% of a terminal diolefinic hydrophobic macromer having a molecular weight from about 400 to about 8000 is disclosed 
{ TAIL ~ A water insoluble hydrophilic gel } comprising : about 30 to about 90 % of a hydrophilic polymer of identical or different watersoluble mono olefinic monomers , or copolymer of said watersoluble monomers with 1 to 70 % of water insoluble , identical or different mono olefinic monomers , { HEAD ~ which polymer } or copolymer is cross linked with about 10 to about 70 % of a terminal diolefinic hydrophobic macromer having a molecular weight from about 400 to about 8000 is disclosed
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