A 4 minute read, written in October 2026 and read over again on 16 October 2026
Carbon vs fibreglass padel rackets: what actually matters
A padel racket's face is usually fibreglass or carbon fibre woven at different densities, labelled 3K, 12K or 18K, and the weave changes stiffness more than it changes raw power. Here is what the face and the core underneath it actually do.
Fibreglass, soft and forgiving
A fibreglass face flexes more on contact than carbon does, which gives the ball a longer, softer dwell time on the strings and makes off-centre hits feel gentler on the arm. That flex costs a little pure pace compared with a stiffer carbon face, which is exactly why fibreglass rackets like Bullpadel's Flow Light sit at the beginner and comfort end of most brands' ranges rather than the finishing end. It is also cheaper to manufacture well, which is part of why a good fibreglass racket at a modest price often outperforms a poorly built carbon one at a similar cost. The split shows up clearly in the Lab's racket finder, run over every combination of its twelve questions: fibreglass is the top pick for 78% of first-year profiles, while carbon takes over for 84% of profiles built around tournament level play.
Carbon, and what 3K, 12K and 18K actually mean
The number refers to how many carbon filaments are bundled into each thread of the weave before it is set into the face, and a higher number generally means a tighter, stiffer, more direct weave. A stiffer face transmits more of the swing straight into the ball rather than absorbing some of it in flex, which reads as more power and more feedback in the hand, for better and for worse. It is not a straight ladder where 18K is simply better than 3K; a stiffer face is also less forgiving of an off-centre hit and can feel harsh in a hand that mishits often. Mid-range carbon rackets such as Wilson's Carbon Force or Babolat's Counter Viper sit deliberately short of the stiffest weaves on the market, trading a little pace for a face that still forgives a rushed shot.
Soft EVA, the comfort core
Underneath the face sits a foam core, and soft EVA is the version that absorbs vibration rather than returning it to your arm. It also spreads the sweet spot a little wider than a harder foam would, which is why soft EVA turns up in rackets built for beginners, for players managing an elbow, and in control-focused rackets right up through advanced levels, such as Nox's ML10 line or StarVie's Metheora, a soft-core teardrop plenty of players with elbow history eventually land on.
Your call
You return serve with a deep cross-court lob. The server retreats and plays a bandeja. Where should you and your partner be as it is struck?
Return lob, then advance to the service line and split as they hit the bandeja. The next step depends on the depth.
Hard EVA, the power and feedback core
Hard EVA compresses less on contact, giving back more of the ball's energy and more power to a player who already strikes the centre of the strings consistently. The trade is a smaller effective sweet spot and considerably more feedback, comfortable or otherwise, on anything struck off-centre. Bullpadel's Vertex and Hack and Adidas's Metalbone all pair a hard core with a diamond shape for exactly this reason, power layered on power for a player who can handle both, while diamonds with a medium core such as Siux's Diablo sit a notch gentler for a strong player not quite ready for the very stiffest combination.
Foam cores, the lightweight option
A small number of lighter, more affordable rackets use a simpler foam core rather than an EVA rubber compound, usually to keep total weight down for a smaller player or a genuine first racket. They are not automatically worse, just different: typically a softer, less lively feel that suits a beginner learning control before power, and one reason very light rackets aimed at juniors and small-framed adults exist at all. A foam core will not last quite as many seasons of hard hitting as a proper EVA rubber compound, which is a fair trade for a racket that is only ever going to be someone's first one anyway.
What the finder picks as experience grows
Run over every combination of its twelve questions, the Lab's racket finder moves face material steadily toward carbon as the experience answer climbs: fibreglass leads for brand new players at 78%, carbon overtakes it by the mid experience answer, and carbon reaches 84% once the answer is tournament level play. Weight and balance still decide most of the feel of a swing, and a soft-core fibreglass racket in a strong player's hand still hits plenty hard, while a stiff carbon diamond in a beginner's hand mostly hits the frame. The honest way to judge a face and core combination is still to hit with it for half an hour, since two rackets with an identical face and core on paper can feel noticeably different once weight and balance are added back into the mix. The racket finder weighs all four specs together rather than treating any one of them as the whole answer, and the buying guide walks through the same decision in plain language.
Read the rest of this part 1 min
The glossary entry on EVA is a quick reference if the core terms above need revisiting later, and the injuries guide is worth reading alongside this one if a sore arm is part of the decision.
Today's Scenario will ask you to read a shot before you play it; a face and core that suit your hand mean less of that thinking gets spent on the racket and more on the point.