Speedo Aqua Fit train Swim Gloves  material : durable , easy to put on . adjust wonderful , smoothly , tight to you hand with close a easy magic zip -lrb- provide you choose right size for you hand -rrb- Mantainance : easy . I only water they with tap water after training and hold they in clothing line to dry . training : this be the only difficult part : they get really heavy as they get wet ; plus the flap between finger ; it make I to push and pull harder . you feel the effort in you upper arm and shoulder but that be what you be look for : be it not ? after you wear they for some couple of hundred meter and you take they off and keep swim you will understand what I be try to explain . important : you maintain you regular stroke as they fit as a natural glove to you hand . it be not like paddle that be hard material and force you -lrb- without you notice -rrb- to change the way you should keep you hand , angle , elbow , forearm , and so on in each step of you stroke . at the end , you really strengthen the muscle you need for a harder and more effective stroke . I do really recomend this product . Rafael -lrb- master h -rrb- Caracas - Venezuela