do these run wide? My grand daughter has a very wide foot.

No, do not run wide. The are true to size - standard. However, they are made to stretch and flex. The rubber around the foot has to be tight, to stay on while swimming. They are generally more difficult to get on, but excellent at staying on.

How do the sizes translate to actual shoe sizes?

After a lot of research, it's all still trial and error. My son will be 5 in a few days. He just updated his sneaker size to Nike 12C (12 children). The XXS Finis fins are too small, but just barely. He'd be much better suited for the XS size. He has high arches and ridiculously wide feet.

Why do these come covered in slimy stuff?

That will come off once you use it the first time or you can wash them off with some liquid detergent. It is a coating the fins come with to keep them from drying out and to keep their bright colors to look good for retail sales. It will not interfere with its wear. Lynn from Swim Zone Inc.

Hi my son is 10 years old and he used shoes size 7. Which size will be?

If you are talking about a size 7 in mens shoes, which is like an 8 or so in women's shoes, then get the L MEN 7-9. (Does he has fairly large feet for his age?) I wear a size 8-8.5 in women's shoes and got the Large size fins. They fit correctly. Plus buying a size a little too big is MUCH better than too small, because his feet will grow!

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FINIS Long Floating Swim Fins - Adult Training Fins - Improves Kick Technique & Body Position

Product ID: 762515

Details

Brand
FINIS
Color
Red/Gray
Fit Type
Regular
Material
Rubber
Sport
Swimming

🌊Max buoyancy for effortless glide

⚙️Durable rubber blade for powerful propulsion

🏊‍♂️Optimized body alignment & kick technique

€ 139.93

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌟 Elevate your swim game—float, kick, and dominate every lap!

KICK LIKE A PRO - Engineered feedback trains you to elongate your kick from the hips, not knees.
JOIN THE SWIM ELITE - Trusted by 11,000+ swimmers with a 4.5-star rating—don’t get left behind.
FLOAT ABOVE THE REST - Long floating fins lift your legs, reducing drag and perfecting your swim posture.
UNIVERSAL SWIM UPGRADE - Designed for all skill levels—whether you’re a weekend warrior or aspiring Olympian.
BUILT TO LAST READY TO RACE - Premium rubber construction ensures durability in both fresh and saltwater.

FINIS Long Floating Swim Fins are expertly crafted adult training fins that maximize buoyancy and forward propulsion. Their long rubber blades lift legs to the water surface, reducing drag and improving body alignment while providing essential feedback to refine kick technique. Suitable for swimmers of all levels, these durable fins enhance training efficiency in both fresh and saltwater environments.

Specifications

ASIN	B001M0O4YU
Age Range Description	Adult
Best Sellers Rank	#812 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #2 in Swimming Training Fins
Brand Name	FINIS
Closure Type	Pull-On
Color	Red/Gray
Customer Reviews	4.5 4.5 out of 5 stars (11,228)
Fit Type	Regular
Global Trade Identification Number	00616323200821
Included Components	Long Floating Fin 7-9 Red/Gray
Item Type Name	FINIS Long Floating Fins
Item Weight	720 g
Manufacturer	FINIS
Manufacturer Part Number	1.05.037.06
Material Type	Rubber
Model Number	1.05.037.06
Number of Items	1
Sport Type	Swimming
UPC	616323200821
Unit Count	1 Count
Warranty Description	30 Day Limited

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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€ 139.93

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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