Abstract: Described herein are reactive polyurethane elastomers which may be included in photopolymerizable compositions. Such compositions may be useful in three dimensional printing. Also described are methods of making these polyurethane elastomers. It has been found that the instantly describe elastomers allow for production of 3D printed objects with a unique combination of increased resilience while maintaining requisite strength numbers, making them particularly suitable in a number of industries including shoe soles and medical devices.