Block copolymers include a poly -methyl--valerolactone (PMVL) block. The PMVL blocks can be formed from biosynthesized -methyl--valero lactone (MVL). The block copolymers can include hard blocks. The block copolymers can be thermoplastic elastomers.

There is provided a soft tissue implant pocket which reduces the incidence of capsular contracture. The pocket is manufactured from a biodegradable, biocompatible polyurethane foam. The polyurethane contains biodegradable polyols and the foam has a pore size configured for cellular infiltration. The soft tissue implant pocket find use in, for example, breast augmentation and reconstruction.