Apeks RK4 Fins w/Adjustable Spring Heel Straps
† The new Apeks RK4 fins are on order and currently on their way to the US; expected to be available by mid-February 2025.
Dive Gear Express will accept fins for return if you order the incorrect size. However, you will be responsible for return shipping costs. Return shipping costs on fins can be expensive because fins have a high 'dimensional weight'. Your complete satisfaction is our goal, so please consider carefully before purchase.
Slightly stiffer than the classic RK3, the new Apeks RK4 is a technical fin in modern style that delivers ultimate performance. Perfect for frog kicking, the Rk4 provides exceptional maneuverability and allows small, precise movements in confined spaces, reducing disturbance from sand and silt. Provides a more energy efficient dive with optimal performance on both the up and down strokes. Adjustable stainless steel spring straps allow quick and easy changes between wetsuit and drysuit settings, with 2 adjustment points. Reduces the risk of snags with integrated stainless steel buckles that are durable and strong, easy to don and doff even with heavy gloves.
Fin Foot Pocket Dimensions
| Fin Size | Length (Overall) |
Length (Toe to Top) |
Width (Opening) |
Height (Opening) |
Men's (soft sole) US Size |
EU Size |
| Small | {19.0 in | 48.6 cm} | {8.2 in | 20.8 cm} | {3.0 in | 7.6 cm} | {2.7 in | 6.8 cm} | 6 - 7.5 | 36 - 38 |
| Medium | {19.3 in | 49 cm} | {8.7 in | 22 cm} | {3.5 in | 9 cm} | {3.3 in | 8.4 cm} | 7 - 10 | 39 - 41 |
| Large | {21.5 in | 54.5 cm} | {10.0 in | 25.5 cm} | { 3.7 in | 9.5 cm} | {3.5 in | 8.9 cm} | 10 - 11 | 42 - 44 |
NOTICE: Dive Gear Express always ships unused new fins, but all fin materials have some characteristics that upon close inspection can make new fins appear aged or used. By design, all fin materials are soft regardless of brand, so handing during manufacturing and shipping through various points of the supply chain will inevitably cause the appearance of some minor cosmetic scuffs. Some fin materials, especially rubber, also contain a mold release agent that exhibits a gradual "blooming" of a haze on the surface of the fin as it dries following manufacturing, giving the appearance of oxidation and aging. If the cosmetics are bothersome then they can be improved by scrubbing the surface with ordinary soap, water and a cloth.
| Brand | Apeks |
|---|---|
| SKU | APX-RK4 |
| Weight | 6.000000 |
Customer Reviews
What Size Fins Do I Need?
Unlike shoes, the question is difficult to answer with fins because a 'shoe' size is only part of the answer. The brand and type of neoprene bootie you wear, particularly if you wear heavy soled or rock boots, will have as much effect on the selection of fin foot pocket as the shoe size. Some people, especially those with high arches, prefer a loose fit in their fin and others prefer a snug fit. Fitting drysuit boots in the very large sizes is especially problematic.
There is no size standardization between brands of fins (or even between different models from the same brand) and so you cannot assume that a size in one brand of fin is the same dimensions as the size in another brand; even when the designs look very similar. Taking some actual measurements of your boot while on your foot and comparing to our foot pocket dimension charts will help determine the size selection for your desired fit.
Determine your correct size before you order! If you are not certain about your fin size then our recommendation is not to order until you can obtain that information. While Dive Gear Express will accept fins for return, you will be responsible for return shipping costs. Return shipping costs on fins can be expensive (especially from an International location) because fins are a relatively low priced item that has a high 'dimensional weight'. Your complete satisfaction is our goal, so please consider carefully before purchase.
