{"product_id":"arena-powerfin-pro-ii-swim-training-fins-plum-arctic-lime-size-9-5-10-5-short-blade-silicone-left-right-fit","title":"ARENA Powerfin Pro II swim training fins Plum\/Arctic Lime Size 9.5-10.5 — short blade silicone, left\/right fit","description":"\u003cp\u003e\u003cstrong\u003eARENA Powerfin Pro II are short-blade silicone training fins shaped for left and right feet to boost kick speed, control, and underwater efficiency during swim sessions.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eBuilt for competitive swimmers and focused training, the Powerfin Pro II combines a short, sloping blade profile with hydrodynamic slits and bottom notches to accelerate your leg turnover while keeping ankle movement natural. The open-heel, anatomically shaped foot pocket is made from soft silicone to reduce chafing and maintain comfort through repeated sets. PVC-free construction and molded left\/right shaping make these fins a durable tool for refining body position, kick mechanics, and propulsion.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these fins improve my kick and underwater phase?\u003c\/h3\u003e\n\u003cp\u003eThe Powerfin Pro II’s short blade and sloping surface reduce drag while amplifying the snap of each kick, letting you train a faster turnover and stronger downward drive. Hydrodynamic slits and bottom notches channel water for a more controlled, efficient stroke so each repetition reinforces correct movement patterns.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eShort blade increases cadence without overloading hips or ankles\u003c\/li\u003e\n  \u003cli\u003eTop slits break up flow for smoother water release\u003c\/li\u003e\n  \u003cli\u003eBottom ribs and notches add propulsion on the downbeat\u003c\/li\u003e\n  \u003cli\u003eLeft\/right shaping supports natural foot biomechanics\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill the open heel and silicone fit feel comfortable during long sets?\u003c\/h3\u003e\n\u003cp\u003eThe open-heel design allows full ankle flexion, which is essential for realistic kick mechanics and comfort during interval work. Soft silicone foot pockets mold to your feet and reduce hotspots and blister risk compared with stiffer materials.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSoft silicone reduces friction and pressure points\u003c\/li\u003e\n  \u003cli\u003eOpen heel increases range of motion for realistic kicking\u003c\/li\u003e\n  \u003cli\u003eErgonomic left\/right shaping prevents uneven strain\u003c\/li\u003e\n  \u003cli\u003ePVC-free material for long-term durability and comfort\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I use Powerfin Pro II in training sessions?\u003c\/h3\u003e\n\u003cp\u003eUse these fins for technique drills, vertical kicking, sprint sets, and warm-ups to target the underwater phase and leg power. Short intervals with high turnover and vertical-kick drills are especially effective for translating fin-assisted tempo into unassisted speed.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVertical kick sets to refine body position and underwater motion\u003c\/li\u003e\n  \u003cli\u003eSprint repeats for turnover and explosive leg drive\u003c\/li\u003e\n  \u003cli\u003eTechnique-focused laps to rehearse a compact, efficient kick\u003c\/li\u003e\n  \u003cli\u003eWarm-ups to build confidence in ankle flexibility and rhythm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I choose the right size and care for these silicone fins?\u003c\/h3\u003e\n\u003cp\u003eRefer to the ARENA size chart to match the 9.5–10.5 option to your usual shoe size or measured foot length for the best fit; the soft silicone pocket offers some conformity. Rinse with fresh water after each use, dry away from direct sunlight, and store flat to preserve blade shape and silicone integrity.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFollow ARENA size chart for accurate sizing and fit\u003c\/li\u003e\n  \u003cli\u003eRinse thoroughly after chlorine exposure to extend life\u003c\/li\u003e\n  \u003cli\u003eAir-dry away from heat and UV to prevent material breakdown\u003c\/li\u003e\n  \u003cli\u003eStore flat or laid out to avoid blade warping\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The ARENA Powerfin Pro II is intended for competitive swimmers, triathletes, masters athletes, and coaches who want a training fin that emphasizes faster kick cadence, improved underwater technique, and reliable comfort. If you regularly do technique drills, vertical kicking, or sprint work and prefer a short, responsive blade that’s anatomically shaped and PVC-free, these fins are a practical upgrade for pool-focused training.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these fins suitable for beginners?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They’re best for swimmers with some technique experience; short blade design encourages faster cadence but may feel strong for absolute beginners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use them for open-water training?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—durable silicone and open heel work in pools and open water, but practice in controlled conditions before long-distance use.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ARENA","offers":[{"title":"Default Title","offer_id":59363000975708,"sku":"B0DFY58TY5","price":110.62,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1059\/5604\/9244\/files\/arena-powerfin-pro-ii-front-view.jpg?v=1791216721","url":"https:\/\/sportium.co.uk\/products\/arena-powerfin-pro-ii-swim-training-fins-plum-arctic-lime-size-9-5-10-5-short-blade-silicone-left-right-fit","provider":"Sportium Sports And Outdoors","version":"1.0","type":"link"}