The C4 Carbon MB001 fins are long carbon fibre fins for spearfishing and freediving, with an 806 x 195 mm T700 carbon blade on the C4 250 foot pocket. They suit UAE spearos and freedivers who want a light, lively kick for deep drops and long surface swims in the Gulf and on the east coast.
This pair has the 25+ blade, which C4 rates soft to medium: its Reverse Parabolic lamination pushes like a standard 30 while it feels like a 25 in the water. Rounded water rails run from the foot pocket to the blade tip, and the fins are made in Italy by C4.
Features
Feature
What it does for you
Reverse Parabolic lamination
Flexes most near the foot, so a 25+ blade pushes like a standard 30 with less effort.
T700 carbon fibre blade
Light and springy for fast restarts from the bottom and long fin-ups.
Integral rounded water rails
Keep water on the thrust area from the foot pocket to the tip and cut side vortexes.
C4 250 foot pocket
TPE 75 ShA on a rigid sole with a 3 degree preformed angle for direct power and comfort.
Interchangeable blades
The 250 foot pocket also takes C4 MB carbon blades and UP technopolymer blades.
Specification
General
Brand
C4 Carbon
Model
MB001
Model code
0SC4250B42
Type
Long blade carbon fins, full foot
Made in
Italy
Blade
Blade material
T700 carbon fibre
Blade dimension
806 x 195 mm
Fin length (size 42/43)
920 x 195 mm
Stiffness
25+ (soft / medium)
Water rails
Rounded section, integral, black
Foot pocket
Model
C4 250
Material
TPE 75 ShA overmoulded on a rigid sole
Preformed angle
3 degrees
Foot pocket weight
About 250 g (size 41/42)
Compatible blades
C4 MB series carbon blades, UP technopolymer blades
Shipping and package
Package size (L x W x H)
98 x 25 x 12 cm
Shipping weight
2 kg
CUSTOMER REVIEWS
Frequently Asked Questions
Which size of C4 MB001 fins should I choose?▼
Measure your foot from heel to big toe. Size 42/43 (US 8.5/9.5) fits a foot about 272 mm long and 105 mm wide on the C4 250 foot pocket chart; see the Size Chart tab for every size.
What does the 25+ stiffness of the MB001 mean?▼
C4 rates 25+ as soft to medium. The Reverse Parabolic lamination lets a 25+ blade push about as hard as a standard 30 while it feels like a 25 in the water, so it suits most spearfishers and freedivers.
Can I fit other blades to the C4 250 foot pocket?▼
Yes. C4 states the 250 foot pocket is compatible with all carbon blades of the MB series and with the UP (Umberto Pelizzari) technopolymer blades.
Source: C4 250 foot pocket size table (2025) on c4carbon.com. Measure foot length from heel to big toe against a wall, and width at the widest part of the foot. Only the sizes shown as selectable on this page are in stock.
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C4 Carbon MB001 Carbon Fins 25+, T700 Carbon Fibre Long Blade Spearfishing and Freediving Fins with 250 Foot Pocket
