Sperry Syren Gulf Duck Boot The Syren Gulf duck boot from Sperry is ready to take on the elements and keep you comfortable. With a quilted nylon and rubber upper, combined with a fleece lining and rubber sole, this pair ensures a padded, secure fit. Click here for Boot Measuring Guide. Item # 472365 UPC # 018464873498 FEATURES Nylon & rubber upper Lace-up closure Partial inside zipper closure Round toe Fleece lining Removable cushioned insole Approx. 4.75" shaft height Approx. 9" leg opening 1" block heel Rubber treaded sole Imported NWT size 9