Best Squash Strings: Top Picks for Power & Control

If one string defines squash, it is this one. The 305 has been the reference squash string for decades — the fluorescent green bed you see in club rackets, pro rackets and restringing shops everywhere. Its construction explains the reputation: hundreds of fine polyamide microfibres saturated in polyurethane — Tecnifibre states a 45% PU concentration, the highest in its own range — and finished with an SPL (Silicon Pyrogene Lubritec) anti-abrasion coating. The result is a multifilament that pockets the ball, returns clear feedback at impact, and holds its shape of play better than basic nylons. Retailers describe it, in Tecnifibre’s own positioning, as the closest feel to natural gut in the range — and at the front of the court, where a drop shot is decided by millimetres of dwell, that soft, connected feel is exactly what control players are buying.

The 305 also ships as a factory string where it matters: it is the fitted string in Mostafa Asal’s Tecnifibre Slash 120 Control, the frame in our pro rackets guide chosen by the most physical player on tour for feel and control rather than durability. Choose your gauge by honesty about your game. The 1.10 mm is the connoisseur’s pick — maximum bite and feel, and the fastest to fray. The 1.20 mm is the reference set most club players should start with. The 1.25 mm trades a little liveliness for a bed that survives heavier hitting and longer intervals between restrings. None of the three is a power trampoline; the 305 rewards a full, clean swing with precision rather than giving pace away free, which is precisely why it tops this list for the guide’s power-and-control brief: it delivers control in full and power on request.

Dynamix VP is Tecnifibre’s power answer, built on the same multifilament idea as the 305 but processed for elasticity. The VP stands for Vapor Process: the polyamide fibres are treated to add stretch and rebound, so the bed deforms a fraction more at impact and fires the ball back with less effort from the swing. Tecnifibre and its retailers position it for maximum power and shock absorption, and as a noticeably softer string than the firm’s DNAMX — the same easy pace, with more comfort and, in their words, better control as a result. For the club player whose drives keep dying a foot short of the back wall, that extra elasticity is the most direct fix a restring can offer.

There is a strong factory-fit endorsement behind it, too: Dynamix V.P. is the string Tecnifibre fits as standard across its Carboflex line — the best-known racket family in the modern game — which means the frames in our pro guide reach their players strung with this exact string. Gauges run 1.15, 1.20 and 1.25 mm. Take the 1.15 if your swing is compact and you want every bit of help with length; the 1.20 is the all-round set; the 1.25 keeps most of the pop with a sturdier bed for players who also value a longer restringing interval. If the 305 is the scalpel, Dynamix VP is the catapult — pick it when your problem is pace, not placement.

Ashaway built the SuperNick ZX to solve two problems at once: strings that snap, and strings that survive but go loose and lifeless. The construction is a hybrid — a multifilament nylon core for ball feel, wrapped in a ZX wear layer woven with Zyex filaments, the high-tensile fibre Ashaway uses across its premium lines for stiffness and durability. The surface is textured to bite the ball for cut and spin, and the whole string comes in a hi-visibility orange that is easy to spot against the front wall. Ashaway says it spent more than a year developing the string to combine the playability of its long-running SuperNick XL with the tension-holding character of its Zyex strings — and the published specification supports the intent: a single 1.25 mm gauge, rated by the maker for stringing tensions up to 40 lb, higher than most strings on this page.

Who is it for? The player who restrings because the bed feels dead rather than because a string snapped will notice the difference a Zyex layer makes to how long the bed keeps its snap — and the player who does snap strings gets a 1.25 mm multifilament that does not feel like a rope. It is the firmest, most controlled-feeling Ashaway here: less free power than the two Nicks below it, more precision and a longer useful life. If your game is built on hard, flat hitting several times a week, this is the card to circle.

X-One Biphase is the technology flagship of Tecnifibre’s squash line — the string the company builds when it is showing off. Three technologies share the work. Elastyl fibres supply the elasticity behind its power. H2C fibres — processed through a patented Trimerization treatment developed to keep the fibre links stable through extreme temperature swings — are there for tension maintenance and control. And the Biphase process itself, a post-production treatment that strengthens the bond between the thousands of microfilaments, is credited by Tecnifibre with extending string life by around 20% over a standard multifilament. The fibres sit in PU 400 polyurethane, and the playing character follows the recipe: maximum efficiency off the strings, a refined, connected feel, and comfort that flatters delicate shots.

So how does it differ from the 305 at number one? Think of the 305 as the benchmark all-rounder and the X-One as the connoisseur’s refinement of the same idea: a touch more elasticity, a touch more process technology, in gauges of 1.18 and 1.24 mm and a choice of orange or natural. Players who live at the front of the court — who win points with hold, deception and drops that die in the nick — are the ones who will appreciate what the extra engineering buys. Everyone else should start with the 305 and arrive here when they know exactly what they are looking for.

PowerNick 18 is Ashaway’s answer to a classic dilemma: thin strings play beautifully and break rudely. Its three-layer construction puts a core of multi-stranded Zyex filaments — a fibre with very high tensile strength — inside an outer spiral braid, finished with a proprietary coating that Ashaway says eases stringing and adds durability. At 1.15 mm it sits in the thin, lively class, but the Zyex heart means it holds tension and survives knocks far better than a plain nylon of the same diameter. Ashaway positions it bluntly as the optimum combination of power and durability, and the string has form at the top of the game — it has even been fitted as standard in some Black Knight tour frames.

The textured spiral surface is the other half of the story: it grips the ball, so players who cut their drops and slice their boasts get extra bite to work with. One instruction matters if you choose it: Zyex plays stiffer than nylon, so Ashaway directs stringers to fit PowerNick at roughly 10–20% lower tension than a conventional nylon string to reach the same playing feel — tell your stringer, because a PowerNick bed strung at your usual nylon tension will feel tighter and less forgiving than you expect. There is also an even thinner 1.05 mm PowerNick 19 in black for specialists; the 18 is the one to buy first.

Karakal’s Hot Zone Braided 120 is the string on this list that asks the least of your wallet and gives back the most balance. The recipe is a hi-tensile multifilament core wrapped in a braided outer twist of response filaments, finished with a textured nano elastomer resin coating that Karakal credits with shock absorption, feel and durability. At 1.20 mm it sits exactly in the middle of the gauge range — thin enough to stay lively, thick enough to last — and Karakal’s own billing, an excellent combination of power and control with limited drop-off even on off-centre hits, matches how an all-rounder should behave. It also has tour credibility of the most practical kind: the Hot Zone 120 is the factory string in Joel Makin’s Karakal Raw Pro 2.2 from our pro rackets guide.

The value case deserves spelling out, because it is where this string beats the premium names for a big group of players. If your racket came from the budget end of the market — the frames in our guide to the best squash rackets under $100 ship with serviceable but ordinary strings — then a Hot Zone restring is the single biggest playing upgrade available to you, transforming a dead factory bed into a responsive multifilament for the cost of a string set plus your stringer’s labour. Five colours (black, blue, green, orange and red) and availability in 11 m sets or 110 m and 220 m coils for home stringers round out a thoroughly practical package.

UltraNick 18 is the gentle sibling in Ashaway’s Zyex family. Where the PowerNick builds its core from Zyex filaments for tensile strength and bite, the UltraNick uses a Zyex multifilament construction — finer strands, a softer layup — that Ashaway explicitly positions as the softer-feeling alternative, delivering what it calls tremendous power and resilience with a more forgiving touch. The braided surface keeps the family’s grip for control and spin, and Ashaway rates the string’s tension stability highly, which is the practical Zyex dividend: the bed you play in month two feels much closer to the bed you paid for in week one.

Choose it if the PowerNick’s spec sheet appeals but its firm, bite-first character does not — or if you simply prefer a cushioned impact feel over long sessions. At 30 lb maximum recommended tension (maker guidance, and again with the instruction to string Zyex 10–20% lower than an equivalent nylon), it suits a medium-tension setup rather than a board-tight control bed. A thicker 1.25 mm UltraNick 17 in optic green exists for players who want the same soft Zyex character with maximum durability. Sets run 9 m, reels 110 m, in a distinctive blue that stands out in the stringer’s tray and on court alike.