As an older surfer ,lighter the better ,to and from surf !,in the wateri like a moderate weight,as I mostly ride longer boards,for glide ,momentum ect ,and it's often windy with backwash as well,at my local,reef ,lagoon set up,I was lucky enough to score a Gong 8,4 karmen and it was in the era of the lightest build they did in the pro range(thanks Colas for the research and info) that board was great to surf !and it's weight was addictive in the water ,performance wise,probably the best I have surfed shortboard style !but with any build that light they are quite fragile !and for me could over react / be a hand full on the windy / backwash days.IMO,The build quality/weight of the infinity product is spot on,as the Jimmy Lewis boards, both coming from the Kinetic factory this is not a promo for either boards or factory it's my experience over many years and board failures.The eternal request /problem for board manufacturers ,I want the lightest but strongest board you can make,but it has to be inexpensive !