





💨 Glide faster, train smarter, feel unstoppable!
Speedo’s Unisex Swim Training Fins combine innovative Reverse V Rail technology with ultra-soft silicone for unmatched comfort and speed. Designed for versatile use—from lap training to bodysurfing—these fins reduce fatigue and improve kicking efficiency, making them a must-have for swimmers seeking performance and joint-friendly support.











| ASIN | B0FCW9N9WW |
| Age Range (Description) | Adult |
| Best Sellers Rank | #10,271 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #1,699 in Swimming Equipment |
| Brand Name | Speedo |
| Customer Reviews | 4.4 4.4 out of 5 stars (1,134) |
| Date First Available | August 26, 2025 |
| Included Components | Swim Fins |
| Item Package Dimensions L x W x H | 14.02 x 7.6 x 3.74 inches |
| Manufacturer | Speedo |
| Model Name | Swim Training Fins Silicone |
| Number of Items | 1 |
| Package Weight | 0.67 Kilograms |
| Part Number | 8-00536101653-2XS |
| Size | XX-Small |
| Style | Swim Training Fins Biofuse |
| Suggested Users | unisex |
| UPC | 196555607822 |
L**E
My favorite out of many
Simply awesome! I swim laps frequently I usually blister with other makes/models. Not with these. No water socks needed. The foot pocket feels super soft. I love the feel/cadence I have with these in free/back and fly. Feels very natural with my normal kick rhythm. They have the nice rythm of something longer like the trialon, but in a far more compact package and are way more comfortable for me.
D**E
Love at first swim! These fins keep my arthritic knees in proper alignment, and feel amazing!
I have recently started swimming after a long period of complete inactivity due to health issues. For reference, I am a 45 year old woman, walk with a cane, need total knee replacement in both knees due to bone on bone arthritis, and had arthroscopic knee surgery (to remove loose bone fragments) just a few months ago. Because I need to be so careful with my knees, I researched and considered all my options before choosing these. I was advised by a swim coach and trainer (and the info online I found) that I needed to find shorter fins, ideally with a notch in the center (or an even delta/V-shape at the ends). I just received them today, and headed to the pool to swim laps. The verdict? Love at first swim! I put these on as soon as I warmed up, and didn’t take them off (except for a few laps to test my form) for a solid 90 minutes of swimming laps- my kicking remained in alignment, which is difficult for me because of my knee issues and muscle weakness that has resulted from inactivity. The fit is amazing- I was nervous about rubbing/blisters, but they fit my feet perfectly, with no issues whatsoever. I wear a women’s size 9.5 in athletic shoes, and the medium fit me perfectly. My heels are narrow, and my feet are medium width, but because of previous stress fractures in my feet, I prefer a wider fit shoe... I’m picky about fit, and I rarely find something right away that feels this good on my feet! I was using loaner fins at my local lap pool- Keifer brand, Cruiser models, and the small size Keifer fins were more narrow and were too painful to wear for more than a lap or two, but the medium size was too large for me, even with swim socks. These are JUST RIGHT! While the Keifer fins almost float on top of the water while in use, these seem more neutrally buoyant, which seems to eliminate strain on my back. It was harder for me to control my kicking alignment with the Keifer fins, as well, which resulted in some very painful moments. These fins seem to be just what I needed! The silicone heel and footbed is so soft and comfy, and the fin portion is pretty firm, but not nearly as hard as a body surfing type fin (Churchill, for example). Many reviewers have commented that these fins feel heavy, but I didn’t find that to be the case for me. While some foam-type fins (the kind that actually float) may feel lighter and keep your feet on top of the water, and racing fins may help propel you through the water a faster, these seem to be the “just right” balance for me. With the muscle weakness and knee issues I have, I can’t walk without a cane, so I cannot fathom what the “these fins are too heavy” reviewers are complaining about- if I can use these without becoming fatigued, I think you should be able to use them easily, too! My feet were able to remain just under the surface of the water, and I adjusted to them quickly after just a couple laps. I experienced less knee pain today using these fins versus the Keifer Cruiser fins, or swimming without fins, and feel like I got a great workout! I cannot use my right arm right now because of a rotator cuff tear, so I swam laps for 90 minutes using only my legs. I cannot speak to the effectiveness of these fins for those who swim breaststroke or butterfly because I cannot swim this way- with my knee issues, I am limited to sidestroke, crawl, freestyle or backstroke (though no using arms for me today). I was able to focus more on my form with these fins, which seems to be the point of a training fin! I tried a few laps with fins, followed by a few laps without, to encourage muscle memory, and found that my form already seems to be improving. I put them back on for the remainder of my swim session because they felt so good, and I was looking for a good cardio and leg toning workout. I may consider using a different type of fin at some point if I want to go way faster, but since I’m not racing anyone or being chased by a shark in the water I think these fins are pretty perfect for what I need! I am not being compensated for this review, nor did I receive a discount- I purchased these at full price, and am sharing my thoughts because i find reviews to be incredibly helpful to me when purchasing items online. I hope this helps you with your decision, and that you also enjoy the Speedo Biofuse fins as much as I do! I’ll update my review if needed, but so far, so good!
A**H
good fins, good for training
I swam from age 6 to 18, and have done a small amount of college and masters swimming - I'm 29, and lap swim is now my preferred work out. I looked at a bunch of reviews and was stuck trying to decide between the gold zoomers, these, and a few other pairs. I went with these because they looked soft, and my feet have suffered from zoomers in the past. My right foot especially seems to get very sore from stiff/tight fins. I wear size 10/or 10.5 shoe so I decided to go with the x-large based on overall reviews. It fits just a little loose, which is better than a little tight in my case. They don't fall off or anything, just a little bit of tug on my foot hairs, but that's tollerable. And if you're worried about the reviews saying they are heavy and hard to work out in.. well that's the point - they are for training. I might order the gold zoomers too though, I remember they were hard on my feet in highschool, but according to their website they have a softer material around the foot and the same stiffness in the fin now - similar to the biofuse. It looks like the biofuse has a little more fin length to them, so i'm probably getting a little more distance per kick, but i'm not that picky about my training these days, only that i'm getting a workout and comfortable. These do the job.
H**L
for swimmers
Very good quality, and this is for my younger son - his feedback - ease of use, comfortable with this open heel option!
K**B
Sturdy, but Heavy Fins
These fins may be heavier than some I have tried, but they are very sturdy and wide enough across the ball of my foot. When I first put them on, I hated them due to the weight. I then had a love/hate relationship with them because they felt great on my feet, but were heavy. After using them several times, I have decided that I love them because I realized they are building muscles in my legs that were not used as much with lighter fins. They are now my favorites!
W**L
great fins
great fins!
W**D
If you want to swim with bricks on your feet
I've had a pair of speedo training fins for about 17 years. They've always been a little tight and since my son started swimming with me I thought, "I'll upgrade." Except these are worse in nearly every way. They weigh about twice as much. They do not accentuate your kick. Especially on backstroke they actually force you to drop your stance in a non productive manner. Forget about fly. These are so bulky they force your feet apart unnaturally. Keep in mind I am comparing to 17 year old same brand.
M**.
Size down
I’m a 6.5 in women’s shoes and the xsmall fits me better than the small. The small has a lot of space around the ankle. The xsmall is not too tight (I also have somewhat narrow feet), but my big toe a bit over the edge. However, I doesn’t bother me when swimming. I have been using it for a week and have not had any issues with it. They are great for training.
B**Q
Boosts speed and efficiency. Walking in and out of the water is much easier than with full diving fins. Supercharges the calf muscles. Fit is secure with no worries of them falling off. Recommend
A**B
Just confirm the size before purchasing
F**O
Son muy buenas y cumplen con su objetivo, ya tengo otro par y son extremadamente durables, de hecho estás no las compré para mí
S**T
True to size, conformable
D**O
Indicado para atletas ou praticantes regulares. Para iniciantes é pesado, risco de lesão.
Trustpilot
4 days ago
1 month ago