As much as I hate to, will add to the thread. Up until the last year if a prospective student had their own mask/fins/snorkle I would just tell them it was OK to use what they had for certification. I found it necessary to change this policy to "accepable personal equipment". The reason for this was that students were attempting to use gear that was ill fitting, damaged, or worn out. To save a few bucks they often were borrowing this personal gear from others. For many students and new divers the learing process is difficult enough, let alone fighting a damaged leaking mask or fins that do not fit. I can't count the number of times I have had to give my mask to a student to had a mask that was leaking due to damage or poor fit. You guys always assume the LDS or Instructor is trying to get over on you by offering you something to make diving more efficent or comfortable. As to the specific gear referenced in the initial post: A dry snorkle is not a good choice for SCUBA, as most of them offer too much drag and get in the way but in good conditiion-acceptable; the mask in question if it fits and in good condition-acceptable; Atomic split fins, there are two kinds the good open heal fins and a closed heal. the open heal are OK, the closed heal are too soft for SCUBA and I would not recommend them to a student or anyone who needs gear. Also split fins require a much different kick technique that standard blades, and some additional instruction to use them properly. Because of what I do, I see divers all the time using old, ill fitting, and gear that has out lived it's useful life and as a result the pleasure they would get from diving is deminished. These are often the same people who will line up to buy the latest iphone or other 'hot" fad item. As an instructor all I do is in the best intrest of my students and to ensure that thay are confident and competent divers, dive gear is a part of all OW POIs for that reason.