The Speedo Endurance Jammer in Adult sizes is created from 50 percent polyester and 50 percent PBT. This durable fabric is used with four-way stretch technology to create a body hugging fit that keeps its shape and offers greater comfort. This suit features reinforced seams, a front gusset and non-slip drawstring waist for the ideal fit that lasts up to 20 times longer. Built with Speedo's exclusive Endurance Plus fabric Chlorine-resistant fabric Lasts 20 times longer than conventional swimwear fabric 4-way stretch fabric Provides a body hugging fit and soft feel Material: 50% Polyester / 50% PBT