Apeks RK3 Fins Reviewed   So I’ve had my trusty old Mares Quattro fins for about 15 years now and they’ve always felt part of me when diving and I thought I couldn’t dive without them. I’ve tried lots of other fins and find that they are either too much like hard work or you kick your legs and don’t move anywhere. On a recommendation of one of our other instructors I thought I would buy myself a paid of Apeks RK3 fins. They come in two options, a standard weight for general diving and a tougher, harder and heavier...