Learn to Swim Jammer 410Built with LYCRA XTRA LIFE fiber engineered to have 510 times more durability than ordinary spandex fabrics. Provides resistance to suntan lotions, skin oils and chlorine better than conventional fabrics. Helps resist sagging and bagging, keeping swimwear fitting newer longer. Our exclusive UV Block the Burn with UPF 50 protective fabric features: More body coverage for greater sun protection. Tighter knit fabric for higher level of protection from the sun's harmful rays. Improved fit so overstretched product does not decrease the UPF rating. Internal drawcord.