TYR Womens Thresher, Tracer & Fusion Size Guide

This size guide covers the TYR Thresher, Tracer and Fusion 2 racing kneeskins — Women's, available in sizes 18–38. These are TYR's performance competition racing kneeskins, engineered for competitive female swimmers at club, county, regional and national level. All measurements are body measurements taken directly from your body, not garment measurements.

TYR women's competition racing kneeskins are sized using four key body measurements: Chest, Waist, Hip and Torso. If you are between sizes, use your hip measurement as the primary guide. Always use body measurements rather than your usual clothing size — TYR's numeric sizing does not correspond directly to standard UK sizes.

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Body Measurement Points

How to Measure

Use a soft measuring tape and take all measurements directly against your skin. If you are between sizes, use your hip measurement as the primary guide.

A
ChestMeasure around the fullest part of your chest, keeping the tape horizontal and snug but not tight.
B
WaistMeasure at the narrowest part of your natural waist, keeping the tape level all the way around.
C
HipMeasure around the fullest part of your hips and seat, keeping the tape horizontal.
D
TorsoMeasure from the top of your shoulder, down the front of the body, under the crotch, and back up to the same shoulder point.

Note: If your measurements fall across different size brackets, use your hip measurement as the primary guide. All measurements are body measurements, not garment measurements.

Sizing Table — TYR Thresher, Tracer & Fusion 2 Racing Kneeskin (Women's, Sizes 18–38)

	18	20	22	24	26	28	30	32	34	36	38
Body Measurements
Chest inches	25.5–26	26.5–27	27.5–28	28.5–29.5	30–31.5	32–33.5	34–35.5	36–37.5	38–39.5	40–41.5	42–43.5
Waist inches	20–20.5	21–21.5	22–22.5	23–23.5	24–25	25.5–27	27.5–29	29.5–31	31.5–32.5	33–34	34.5–35.5
Hip inches	26.5–27.5	28–29	29.5–30.5	31–32.5	33–34.5	35–36.5	37–38.5	39–40.5	41–42	42.5–43.5	44–45
Torso inches	51.5–52.5	53–54	54.5–55.5	56–57	59–60	59–60	60.5–61.5	62–63	63.5–64.5	65–66.5	67–68

	18	20	22	24	26	28	30	32	34	36	38
Body Measurements
Chest cm	64.8–66.0	67.3–68.6	69.8–71.1	72.4–74.9	76.2–80.0	81.3–85.1	86.4–90.2	91.4–95.2	96.5–100.3	101.6–105.4	106.7–110.5
Waist cm	50.8–52.1	53.3–54.6	55.9–57.1	58.4–59.7	61.0–63.5	64.8–68.6	69.8–73.7	74.9–78.7	80.0–82.5	83.8–86.4	87.6–90.2
Hip cm	67.3–69.8	71.1–73.7	74.9–77.5	78.7–82.5	83.8–87.6	88.9–92.7	94.0–97.8	99.1–102.9	104.1–106.7	108.0–110.5	111.8–114.3
Torso cm	130.8–133.3	134.6–137.2	138.4–141.0	142.2–144.8	149.9–152.4	149.9–152.4	153.7–156.2	157.5–160.0	161.3–163.8	165.1–168.9	170.2–172.7

All measurements are body measurements, not garment measurements. If you are between sizes, use your hip measurement as the primary guide.

Fit Notes — TYR Thresher, Tracer & Fusion 2 Racing Kneeskin (Women's)

The TYR Thresher, Tracer and Fusion 2 are competition racing kneeskins designed for a close, performance fit. They will feel significantly firmer than a training swimsuit — this is intentional and expected for a racing suit.
If you are between sizes, use your hip measurement as the primary guide.
The Torso measurement is particularly important for kneeskins — if your torso measurement is at the top end of a size bracket, the suit may feel short in the body. In this case, consider the next size up and compare torso ranges.
The suit should be completely wrinkle-free and smooth when correctly fitted, with all seams lying flat against the skin.
The straps should sit flat on the shoulders with no pulling, twisting, or rubbing. If the straps pull excessively, your torso measurement may indicate a larger size is needed.
The leg hems should feel snug but not restrict movement or blood flow and should sit correctly in line with competition regulations.
Allow 10–15 minutes to put on correctly for the first time. Take care with fingernails and jewellery when pulling on the suit.
These are competition suits and not designed for training use. Reserve for races and competition warm-ups to protect the suit's performance properties.
Rinse in cold fresh water immediately after every use. Do not machine wash, tumble dry, iron, or dry-clean.
Unsure? Contact our team or call +44 1827 330600.

Frequently Asked Questions — TYR Thresher, Tracer & Fusion 2 Racing Kneeskin (Women's)

Take four body measurements — chest, waist, hip, and torso — using a soft tape measure against your skin. Compare to the sizing table above. If your measurements fall between two sizes, use your hip measurement as the primary guide. TYR's numeric sizing does not correspond directly to standard UK clothing sizes, so always use body measurements.

TYR explicitly recommend using the hip measurement as the primary guide when between sizes on their competition racing suits. A racing kneeskin must seat correctly over the hips before the rest of the suit can lie flat. If the suit is too small in the hip, it will be difficult to pull on and the straps may pull excessively on the shoulders.

The torso measurement is very important for kneeskins as it determines how the suit fits through the body length and whether the straps will sit correctly on the shoulders. If your torso measurement sits at the top end of a size bracket, the suit may feel short in the body or the straps may pull — in this case, compare your torso measurement to the next size up before making your decision. Speak to a member of staff at Allens if you are unsure.

The Thresher, Tracer and Fusion 2 share the same sizing chart and are all competition racing kneeskins from TYR's performance range. They differ in fabric technology, compression level, and price point. Speak to a member of staff at Allens Swimwear for guidance on which TYR racing kneeskin is best suited to your level and budget.

TYR produces a range of competition racing kneeskins designed for use in sanctioned competitive swimming events. Always check with your event organiser or governing body to confirm that the specific TYR kneeskin you have purchased is approved for the level of competition you are entering, as approval status can vary by product and event.

TYR competition racing kneeskins are designed for a close, compressive fit and will feel significantly tighter than a training swimsuit. This is intentional — the compression is engineered to support the body and reduce drag during racing. The suit should feel firm and snug but should not restrict breathing or movement. Allow 10–15 minutes to put the suit on correctly for the first time.

TYR racing kneeskins are not designed for regular training use. Using them for training will significantly reduce their lifespan and degrade the performance properties of the fabric. Reserve your racing kneeskin for competitions and competition warm-ups. TYR offer a range of training swimsuits designed for everyday pool use — speak to a member of staff at Allens for recommendations.

If you are between sizes, use your hip measurement to determine which size to select. If your hip sits at the top end of the smaller size, selecting the larger size will ensure the suit can be pulled on correctly and will sit flat without excessive tension. Also check your torso measurement — if it sits at the top end of the smaller size, the larger size may give a more comfortable body length. Speak to a member of staff at Allens if you are unsure.

Rinse your TYR racing kneeskin thoroughly in cold fresh water immediately after every use to remove chlorine and salt. Do not machine wash, tumble dry, iron, or dry-clean. Store flat and dry, away from direct sunlight. Avoid contact with sun cream, oils, or petroleum-based products as these degrade the fabric's performance properties.

TYR's original sizing chart lists all measurements in inches. Centimetre equivalents are available in the sizing table above — simply toggle between inches and cm using the button above the table. Both sets of values are body measurements taken directly from your body, not garment measurements.