Polyester vs. Multifilament vs. Synthetic Gut: What’s the Difference in Tennis Strings?

Choosing the right tennis string can be just as important as choosing the right racquet. With so many options out there, it’s easy to get overwhelmed. Among the most popular string types are polyester, multifilament, and synthetic gut. Each brings something different to the table, whether you’re chasing spin, comfort, or durability. Let’s break them down so you can figure out what’s right for your game.|

Polyester Strings: Modern Control and Spin

Polyester strings (often just called "poly") are the go-to choice for advanced players who like to swing big and generate their own power. Made from a single strand of polyester, these strings are known for their durability, spin potential, and control. Poly strings can also be effective for beginner and intermediate players if they are strung at a lower tension.

• Control: Because poly strings have a more muted feeling on contact, it allows players to take big swings and still control the shot. If you have an issue missing long, these could be a good option.

• Spin: The stiff nature of poly strings allows the strings to “snap back” after contact, creating heavy topspin, by far the biggest technological advancement in tennis over the last 25 years.

• Durability: These strings hold up really well, especially for big hitters who break other types of strings quickly. For 4.0 or below level players, you will likely never break a polyester string.

• Downsides: They can be tough on the arm. Players with arm or shoulder issues may want to look elsewhere, as the stiffness can lead to discomfort or even injury if not strung at the right tension or paired with a softer string.
  

Best for: Advanced players who hit hard and want maximum control and spin, or beginner and intermediate players looking for a control friendly option strung at a low tension.

Multifilament Strings: Comfort and Power in One Package

Multifilament strings are made from hundreds (or thousands) of individual fibers twisted or woven together to mimic the feel of natural gut. This construction gives them a soft, elastic feel and excellent shock absorption.

• Comfort: Multifilaments are among the most arm-friendly strings available, making them ideal for players with arm injuries or sensitivity.

• Power: Because they’re more elastic than poly strings, multifilaments return more energy to the ball, helping generate extra pace.

• Feel: They offer a plush response and are great for touch shots like drop volleys or slices.

• Downsides: Durability can be a concern, especially for hard hitters. These strings tend to fray and lose tension faster than polyester.

Best for: Intermediate players, older players, or anyone looking for comfort and a bit of extra pop on their shots. Also great in the crosses for a hybrid string setup.

Synthetic Gut Strings: The Entry Level

Synthetic gut is kind of the “jack of all trades” string. It’s typically made with a solid nylon core surrounded by a few outer wraps. While it doesn’t excel in any one category, it performs reasonably well across the board.

• Balance: Synthetic gut offers a good mix of power, control, and feel, making it a solid all-around option.

• Affordability: It’s often cheaper than multifilaments or polyesters, making it a great choice for casual players or those on a budget.

• Playability: You’ll get decent comfort and responsiveness, though not at the same level as a high-end multi or natural gut.

• Downsides: It doesn’t offer the durability of poly or the plush comfort of multifilament. Think of it as a middle ground.
  

Best for: Recreational players or beginners who want a dependable, cost-effective string without major drawbacks. Also effective in the crosses for a hybrid string setup.

Strings don’t get as much attention as racquets, but they can completely change how your racquet performs. Whether you're chasing more spin, fewer aches, or just more consistency, understanding the differences between polyester, multifilament, and synthetic gut can help you make the right call. Your arm—and your game—will thank you.