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Facts and Fallacies of Fitness by Mel Siff, promotional banner graphic
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Facts and Fallacies of Fitness

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Apparel & Training Gear Sizing

FIND YOUR FIT

Apparel measurements are taken from the garment, laid flat, in inches, except the PARRY Core Shorts waist ranges shown in their chart. Elbow sleeve measurements are body circumferences; see the dedicated section below. Tolerances are listed where applicable. If you're between sizes, size up for a relaxed fit or down for fitted.

Category

T-SHIRTS

OG Gym, Nitro, WTB & Classic Tee

Men's, body length and chest width, laid flat, in inches

OG Gym, Nitro, WTB and Classic Tee size chart in inches
Measurement XS S M L XL 2XL 3XL 4XL
Body Length 27 28 29 30 31 32 33 34
Body Length Tol. 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2
Chest Tolerance 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2
Chest Width 17 1/2 19 20 1/2 22 24 26 28 30

Camo Tee

Men's, length, chest and shoulder width, in inches

Camo Tee size chart in inches
Measurement XS S M L XL 2XL 3XL 4XL
Length 24 26 1/4 28 1/4 29 1/4 30 31 32 1/4 33 1/2
Chest 17 1/4 18 1/4 19 21 23 25 1/4 27 28 1/4
Shoulder Width 14 3/4 16 3/4 18 1/4 20 3/4 22 1/2 23 1/2 24 1/2 26 1/2

Vintage Tee

Men's, body length, chest and sleeve, in inches

Vintage Tee size chart in inches
Measurement XS S M L XL 2XL 3XL 4XL
Body Length 27 28 28 1/2 29 1/2 30 3/4 32 1/4 33 1/4 34 1/4
Chest Width 19 7/8 20 7/8 21 7/8 23 7/8 25 7/8 27 7/8 29 7/8 31 7/8
Sleeve Length 7 1/4 7 3/4 8 1/4 8 3/4 9 1/4 9 3/4 10 1/4 10 3/4
Category

TANKS

Men's OG Nitro Tank

Body length and chest width, laid flat, in inches

Men's OG Nitro Tank size chart in inches
Measurement XS S M L XL 2XL 3XL
Body Length 27 28 29 30 31 32 33
Body Length Tol. +/-1 +/-1 +/-1 +/-1 +/-1 +/-1 +/-1
Chest Tolerance +/-3/4 +/-3/4 +/-3/4 +/-3/4 +/-3/4 +/-3/4 +/-3/4
Chest Width 16 18 20 22 24 26 28
Category

HOODIES & CREWS

Men's Hoodie

Body length, chest and sleeve from center back, in inches

Men's Hoodie size chart in inches
Measurement XS S M L XL 2XL 3XL 4XL 5XL
Body Length 27 1/2 28 1/2 29 1/2 30 1/2 31 1/2 32 1/2 33 1/2 34 34 1/2
Body Length Tol. 1 1 1 1 1 1 1 1 1
Chest Tolerance 1 1 1 1 1 1 1 1 1
Chest Width 20 1/2 21 23 24 1/2 26 1/2 27 1/2 28 1/2 30 31 1/2
Sleeve Length 34 1/2 35 1/2 36 1/2 37 1/2 38 1/2 39 1/2 40 1/2 41 41 1/2
Sleeve Tolerance 1 1 1 1 1 1 1 1 1

Men's Lux Hooded Sweatshirt

Body length and chest width, laid flat, in inches

Men's Lux Hooded Sweatshirt size chart in inches
Measurement XS S M L XL 2XL 3XL
Body Length 26 1/2 28 29 1/2 31 32 1/2 34 35 1/2
Chest Width 19 1/2 21 22 1/2 24 25 1/2 27 28 1/2

Crewneck Sweatshirt

Body length, chest and sleeve from center back, in inches

Crewneck Sweatshirt size chart in inches
Measurement XS S M L XL 2XL 3XL 4XL 5XL
Body Length 26 27 28 29 30 31 32 33 34
Body Length Tol. +/-1 +/-1 +/-1 +/-1 +/-1 +/-1 +/-1 +/-1 +/-1
Chest Tolerance +/-1 +/-1 +/-1 +/-1 +/-1 +/-1 +/-1 +/-1 +/-1
Chest Width 18 20 22 24 26 28 30 32 34
Sleeve Length 32 1/2 33 1/2 34 1/2 35 1/2 36 1/2 37 1/2 38 1/2 39 1/2 40 1/2
Sleeve Tolerance +/-1 +/-1 +/-1 +/-1 +/-1 +/-1 +/-1 +/-1 +/-1
Category

BOTTOMS

Westside Barbell x PARRY Core Shorts — 7-inch Inseam

Black Core Shorts. Waist ranges and inseam in inches, sizes S through XXL.

Westside Barbell x PARRY Core Shorts waist ranges and 7-inch inseam in inches
Size Waist range (in) Inseam (in)
S 29–30 7
M 31–32 7
L 33–34 7
XL 35–36 7
XXL 37–39 7

Waist values for these shorts are listed as ranges. The general laid-flat waist instructions below do not apply to this chart.

Men's Jogger

Inseam, outseam and waist, in inches

Men's Jogger size chart in inches
Measurement XS S M L XL 2XL
Inseam 28 29 1/2 30 30 30 1/2 30 1/2
Length Tolerance 1 1 1 1 1 1
Outseam 38 40 41 41 1/2 42 1/2 43
Waist 26 to 28 28 to 31 31 to 33 33 to 35 35 to 38 38 to 42
Waist Tolerance 1 1 1 1 1 1

Nitro Sweatpant

Inseam and waist, in inches

Nitro Sweatpant size chart in inches
Measurement S M L XL 2XL 3XL
Inseam 29.5 30 30.5 31 32 33
Waist 16.25 17.25 18.25 19.25 20.25 21.25

Westside Men's Sweatpants

J. America 8992. Garment measurements in inches, sizes S through 3XL.

Westside Men's Sweatpants (J. America 8992) garment measurements in inches
Measurement S M L XL 2XL 3XL
Waist Width (Laid Flat) 16.25 17.25 18.25 19.25 20.25 21.25
Inseam 29.5 30 30.5 31 32 33

How to measure: Lay the sweatpants flat and measure straight across the waistband from edge to edge. The waist values above are garment widths, not body waist circumferences. Measure the inseam from the crotch seam to the bottom hem along the inside leg. Compare with a pair of sweatpants that fits you well.

Source: S&S Activewear, J. America 8992 size specifications.

Category

WOMEN'S

Women's Original Gym Tee

Body length and chest width, laid flat, in inches

Women's Original Gym Tee size chart in inches
Measurement XS S M L XL 2XL 3XL
Body Length 25 3/4 26 3/8 27 27 5/8 28 1/4 28 7/8 29 1/2
Body Length Tol. 1/2 1/2 1/2 1/2 1/2 1/2 1/2
Chest Tolerance 1/2 1/2 1/2 1/2 1/2 1/2 1/2
Chest Width 15 1/2 16 1/4 17 1/4 18 1/4 19 3/4 21 1/4 22 3/4
Training Gear

ELBOW SLEEVES

7mm Neoprene Elbow Sleeves

Body circumference measurements in centimeters and inches — not garment measurements.

Slightly bend your elbow 30° and measure your arm circumference 4 inches (10 cm) above the elbow joint.

Westside Barbell elbow sleeve size guide with forearm and lower biceps measurements in centimeters and inches, sizes Small through 3XL. Full measurements are in the table below.

Open the size-guide graphic at full size

Elbow sleeve body circumference measurements in centimeters and inches
Size Forearm (cm) Forearm (in) Lower Biceps (cm) Lower Biceps (in)
S 24.1–29.2 9.5–11.5 26.7–33 10.5–13
M 26.7–31.8 10.5–12.5 30.5–36.8 12–14.5
L 30.5–35.6 12–14 33–40.6 13–16
XL 33–38.1 13–15 35.5–43.2 14–17
2XL 35.6–40.6 14–16 39.4–48.3 15.5–19
3XL 38.1–43.18 15–17 43.2–52.07 17–20.5
Reference

HOW TO MEASURE

Apparel measurements above are taken from the garment laid flat, except the PARRY Core Shorts waist ranges shown in their chart. For elbow sleeves, use the body circumference instructions in the Elbow Sleeves section. To compare against a shirt you already own and love, lay it flat on a hard surface and measure with a tape.

Body Length

From the highest point of the shoulder seam straight down to the bottom hem.

Chest Width

One inch below the armhole, measured straight across from edge to edge. Garment laid flat, not doubled.

Sleeve Length

From the center back of the collar, across the shoulder seam, all the way down to the sleeve cuff.

Shoulder Width

From the outer edge of one shoulder seam straight across to the outer edge of the other.

Inseam

From the crotch seam straight down the inside of the leg to the bottom of the hem.

Waist

Across the top of the waistband, edge to edge. Double the number for full waist circumference.

Tolerance is the acceptable variance per garment. A "+/- 1" tolerance means the actual measurement can be up to one inch over or under the listed size.

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NOT SURE WHICH SIZE TO ORDER?

If you're between sizes or sizing for a specific lift or sport, send us your height, weight, and what shirt size you wear from another brand. We'll point you in the right direction.

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Facts and Fallacies of Fitness - By Dr. Mel Siff

Discover the Truth Behind Fitness Myths
In the world of fitness, it’s easy to get lost in conflicting advice. Facts and Fallacies of Fitness by Dr. Mel Siff, co-author of the renowned book Supertraining, helps clear up the confusion. This book offers crucial insights for personal trainers, coaches, and anyone passionate about fitness. From debunking whether squats damage your knees to exploring whether strength training impacts flexibility, Dr. Siff provides the clarity you need.

Cut Through Misinformation
With so much misinformation surrounding strength and fitness, it's difficult to know what to trust. Dr. Siff dives into the most common misconceptions about exercise, helping you navigate complex topics and avoid harmful training practices.

What You’ll Learn

  • The importance (or lack) of warming up
  • How weightlifting truly affects your body
  • Myths about stretching and flexibility
  • The impact of heavy weights on speed and agility

Why This Matters
Understanding the difference between fact and fallacy is essential for protecting your body and ensuring your training is effective. With Dr. Siff’s guidance, you’ll learn why strength and agility are key to long-term fitness success and how to avoid mistakes that lead to injury.

Who Should Read This
Whether you’re a coach, trainer, or fitness enthusiast, this book offers valuable lessons that will help you approach fitness with a fresh perspective. If you want to train smarter and stay injury-free, Facts and Fallacies of Fitness is a must-read.

Gain Real Insights
This book answers critical questions that often get misrepresented. Dr. Siff simplifies complex fitness concepts, ensuring you can apply them in your workouts or coaching sessions.

Elevate Your Training
Make sure your knowledge is based on science and experience, not myths. With Facts and Fallacies of Fitness, you’ll have the tools to improve your training and your results.

Order your copy today and take your fitness understanding to the next level!
  • 5 stars: 4 (100%)
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M
Michael Schell
Fast easy transaction, quick delivery

Great book. Great price, quick easy transaction, was delivered ahead of schedule.

D
Dennis Suhr

While the book itself is a great informational piece. How can you not want to read books that the legend himself, Louie recommended that strength coaches read and adopt.

R
Rich
Good book

So far this book is very good. Informative and scientific in nature.

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