Polyester vs Multifilament Strings: How to Choose

The single biggest equipment upgrade most club players never make? Their strings. Most recreational players play with whatever the shop strung their racket with — and leave significant performance on the table as a result. Strings affect power, spin, control, and most importantly, your arm health.

The two most common string types you'll encounter are polyester and multifilament. They play completely differently. Choosing the wrong one for your game can mean arm pain, loss of control, or simply leaving power and spin on the table. Here's everything you need to know.

Polyester Strings: Control and Spin at a Cost

Polyester strings — often called "poly" or "co-poly" — are a monofilament construction made from a single polyester fiber. They became dominant on the ATP and WTA tours in the early 2000s, driven largely by players seeking more topspin and control at higher swing speeds.

What polyester does well:

• Control: The low elasticity of poly means the string doesn't launch the ball off the stringbed. Pros and advanced players can swing out fully without fear of hitting long.
• Spin: The low friction between poly strings lets them snap back after contact, generating a slingshot effect that bites the ball for heavy topspin. Open 16×19 patterns amplify this further.
• Durability: Poly strings resist notching and breakage far better than natural gut or multifilament. Big hitters who break multi in hours can get weeks out of poly.
• Tension maintenance compared to... itself: While poly loses tension faster than gut in absolute terms, it starts so low that it remains playable.

What polyester doesn't do well:

• Comfort: Poly is stiff — typically around 200–250 N/mm² compared to 70–100 N/mm² for multifilament. That stiffness transfers shock to your arm at every contact. Arm fatigue, tennis elbow, and wrist problems are significantly more common in poly users.
• Power: Low elasticity means low energy return. Slower swingers struggle to generate depth and pace with poly. The trampoline effect that gives beginners easy power is largely absent.
• Feel for touch shots: The deadened response of poly can make dropshots and volleys feel wooden and imprecise.

Best polyester strings to consider:

The most played poly on the professional tour is Luxilon ALU Power — a 1.25mm (16L gauge) string with crisp feel, excellent control, and moderate spin. Solinco Hyper-G is a favorite among club players for its combination of spin, control, and surprisingly good tension maintenance. Babolat RPM Blast — the string in most of Nadal's rackets — uses an octagonal cross-section to maximize topspin, though it's one of the harsher-playing polys on the market.

Multifilament Strings: Comfort and Power

Multifilament strings are constructed from hundreds or thousands of micro-filaments twisted together and bonded with resin — mimicking the structure of natural gut, but at a fraction of the price. They're the closest synthetic alternative to gut in terms of feel and arm friendliness.

What multifilament does well:

• Comfort: The multi-strand construction is inherently elastic and shock-absorbing. Players with arm problems or beginners who haven't yet developed efficient technique typically play much more comfortably on multifilament.
• Power: High elasticity means significant energy return on every shot — the strings act like a trampoline, launching the ball with speed even on partial swings. This helps slower swingers generate pace.
• Feel: The lively, connected feel of multifilament strings translates well to touch shots. Volleys feel crisper and dropshots have more precision compared to poly.
• Tension consistency: Quality multifilament strings hold tension better than most polys, meaning performance stays consistent for weeks after stringing.

What multifilament doesn't do well:

• Durability: The bonded filaments are susceptible to notching from ball contact and abrasion from other strings. String breakers will go through multi quickly.
• Spin: Without the snapback effect of poly, multifilament generates less topspin. Recreational players won't notice much difference, but competitive players accustomed to heavy spin will.
• Control at high swing speed: The high power level of multifilament becomes a liability for big hitters, who find shots flying long consistently.

Best multifilament strings to consider:

Wilson NXT is widely regarded as the gold standard of multifilament — close to natural gut feel at a manageable price. Tecnifibre X-One Biphase adds better tension maintenance to the category. For maximum arm protection, Tecnifibre NRG2 is the softest option available, rated 10/10 for comfort.

Hybrid Stringing: The Best of Both Worlds

Many advanced players use hybrid setups — polyester in the mains (vertical strings) and multifilament or natural gut in the crosses (horizontal strings). The mains provide the control and snapback spin of poly, while the softer crosses reduce overall stiffness, improving comfort and power.

The classic tour hybrid is ALU Power mains with Wilson NXT crosses. Babolat VS Touch natural gut in the crosses with RPM Blast mains is even more comfortable, though expensive.

How to Choose

Use polyester if:

• You're an intermediate-to-advanced player with a fast, full swing
• You break strings frequently
• You prioritize heavy topspin and control over comfort
• Your arm is healthy and you want to keep it that way with regular restringing

Use multifilament if:

• You're a beginner or recreational player
• You experience arm discomfort, tennis elbow, or shoulder issues
• You have a compact or incomplete swing and need help generating pace
• You play for fun and prioritize comfort over raw performance

Use hybrid if:

• You like the feel of poly for control and spin but need more arm-friendly properties
• You're an advanced player who has experienced arm problems on full poly

The Gauge Question

String gauge (thickness) affects feel and durability. Common gauges run from 15 (thickest, most durable, less feel) to 18 (thinnest, most feel, least durable). Most players use 16 or 16L (1.25mm) as a balance point. Thinner gauges generate more spin and bite but break faster — relevant for poly players seeking maximum spin.

The Bottom Line

For most recreational players and beginners, multifilament strings are the right default. They're more comfortable, provide enough power for developing swings, and won't stress your arm. As your technique develops and you start wanting more control and spin from your strings, experiment with poly — but do it carefully and keep your tension in the lower half of the recommended range.

If you're unsure what string type is right for your specific racket, swing speed, and playing style, RacketIQ will analyze your profile and recommend the right string and tension for your setup.