The wrist and thigh cuffs kit from Sportsheets allows you to progress in bondage. whether you want to hog tie someone or bind wrists to thighs, this will do the trick. All the pieces can be used separately as well. The wrist cuffs are smaller--both in width and length--and secure with velcro. For lighter play or smaller wrists, this will suffice. You may want to swap different cuffs for heavier play, suspension, etc. The thigh cuffs secure using a backpack-type strap and never come completely open. I prefer this design to those of the wrist cuffs. Each cuff has sewn in a keyring that serves as an O loop for attaching clips and other hardware. The thigh cuffs each have a snap clip while the wrist cuffs share one. I wish they would have gone ahead and added a fourth into the set, however; this is easy to remedy nonetheless. Although these could be used with the Under the Bed Restraint system, the cuffs are made from a thicker, foamy Neoprene and are sturdier in general.