Will it fit over a 4 mm neoprene cap? I need a bright second layer for visibility in open water.

Yes.should not be a problem. I swam in SF bay with this cap, an Orange over a latex cap, and the combo kept my from the cold just fine. I tried a neoprene cap with a chinstrap and couldn’t deal with the strap under my jaw. My head actually too hot with the neoprene hood. Never used it again.

Which way should cap be worn? with arena logo on side or front of head? just bought large red 3d cap and it's riding up - i wear logo on side

This Arena silicone cap should be worn with the logo on the side. For a more comfortable fit makes sure the front of the cup is just above your eyebrows and then adjust it through the back of your head. There is another cap, the “Arena 3D Soft Silicone Cap” which is smaller in size and with a tighter fit, this cap has the logo on the front of the cap.

What size is it? Will it fit my boy at 8 years?

This cap comes on one size only and is made for adults, It would be too loose for your 8 y.o boy.

Will it keep the hair dry?

Probably like most caps, it keeps it mostly dry, with some seepage at edges. I ended up needing a bigger cap to fit my hair better. If you have really short hair, this one seems like it would work well because it was quite snug.

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Description

🏊‍♀️ Glide like a pro, swim with confidence!

ECO SMART CARE - Easy to maintain—just rinse with non-chlorinated water and air dry to extend lifespan.
SECURE ALL DAY FIT - Reinforced edges and snug fit keep your cap perfectly in place, no slipping or riding up.
COMFORT MEETS FUNCTION - Soft, flexible material ensures long training sessions without discomfort or pressure points.
STREAMLINED PERFORMANCE - Hydrodynamic flat mold design minimizes water resistance for faster, smoother strokes.
ENDURANCE GRADE SILICONE - Crafted from 100% PVC-free silicone that stays elastic and durable swim after swim.

The ARENAClassic Unisex Soft Silicone Swim Cap is engineered for serious swimmers seeking a durable, comfortable, and performance-enhancing cap. Made from 100% PVC-free silicone, it offers a hydrodynamic fit that reduces drag and stays securely in place thanks to reinforced edges. Ideal for intensive training, this cap combines long-lasting elasticity with a soft, non-slip design suitable for all-day wear.

Specifications

Size	One Size
Color	Black/Silver
Material	Silicone
Brand	ARENA
Target Audience	Men, Unisex-Adults, Women
League	N'est pas applicable
Global Trade Identification Number	03468333887410
Manufacturer	Arena
Fit Type	Regular
Item Package Dimensions L x W x H	7.56 x 4.41 x 0.55 inches
Package Weight	0.05 Kilograms
Item Dimensions LxWxH	3.94 x 2.76 x 1.97 inches
Item Weight	0.01 Pounds
Brand Name	ARENA
Model Name	arena Unisex Classic Silicone Swim Cap
Suggested Users	unisex-adult
Number of Items	1
Part Number	91662-55-NS
Model Year	2015
Style	arena Unisex Adults Silicone Swim Cap
Included Components	Swim Cap
Outer Material	100% Mixed
Sport Type	Diving, Exercise & Fitness, Swimming, Triathlon, Water Sports