Snorkelling fins are very different than scuba fins.  They are shorter, light weight, made to be worn with a bare foot, thin neoprene sock or watershoe.  Snorkelling fins are an important part of your gear.  With a nice easy kick they glide you through the water so you do not have to swim with your arms, they help keep you on the surface,and are needed to assist you to dive down & return to the surface quicker & an important piece of gear to help you in waters with a current.  Light weight for packing & travel.