All measurements are in inches and reflect body measurements. If you are in between sizes, size up for comfort.
Got questions? Email us at info@freeflyapparel.com.
Men
Women
Toddler
Youth
Alpha Sizes
Numeric Sizes
Chest
Waist
Hip
Sleeve
S
30–31
36–38
30–32
34–37
32–33
M
32–33
38–40
32–34
37–39
33–34
L
34–35
41–43
35–37
40–42
34–35
XL
36–38
44–46
38–40
43–45
35–36
XXL
40
47–49
41–43
46–48
36–37
3XL
50–52
44–46
49–51
36–37
Alpha Sizes
Numeric Sizes
Bust
Waist
Hip
XS
0–2
32–33
25–26
35–36
S
4–6
34–35
27–28
37–38
M
8–10
36–37
29–30
39–40
L
12–14
38 1/2–40
31 1/2–33
41 1/2–43
XL
16
41 1/2–43
34 1/2–36
44 1/2–46
XXL
44 1/2–46
37 1/2–39
47 1/2–49
US Size
Height (IN)
Weight (LB)
2T
33–36
27–30
3T
36–39
30–34
4T
39–42
34–38
5T
42–44
38–44
US Size
Height (IN)
Weight (LB)
XS/6–7
45–48
45–50
S/8–9
49–52
51–65
M/10–12
53–57
66–80
L/13–14
58–62
81–95
XL/15–16
63–66
96–110
*Learn how to find your true waist below.
Please find inseam length on specific product detail page.
Don’t let the classic flannel looks fool you—the Seawool Flannel packs a punch in the performance department. Built from Seawool fabric, a midweight brushed twill made from upcycled oyster shells and recycled plastic bottles, these flannels deliver many of the same benefits as our powered-by-bamboo styles: they’re temp-regulating, quick-dry, anti-odor, and oh-so-soft. Bonus points: all those recycled plastic bottles never get the chance to end up in our oceans. Adventure-ready, sustainable, and timeless good looks? Sign us up.
One Size Doesn't Fit All
All measurements are in inches and reflect body measurements. If you are in between sizes, size up for comfort.
Got questions? Email us at info@freeflyapparel.com.
Men
Women
Toddler
Youth
Alpha Sizes
Numeric Sizes
Chest
Waist
Hip
Sleeve
S
30–31
36–38
30–32
34–37
32–33
M
32–33
38–40
32–34
37–39
33–34
L
34–35
41–43
35–37
40–42
34–35
XL
36–38
44–46
38–40
43–45
35–36
XXL
40
47–49
41–43
46–48
36–37
3XL
50–52
44–46
49–51
36–37
Alpha Sizes
Numeric Sizes
Bust
Waist
Hip
XS
0–2
32–33
25–26
35–36
S
4–6
34–35
27–28
37–38
M
8–10
36–37
29–30
39–40
L
12–14
38 1/2–40
31 1/2–33
41 1/2–43
XL
16
41 1/2–43
34 1/2–36
44 1/2–46
XXL
44 1/2–46
37 1/2–39
47 1/2–49
US Size
Height (IN)
Weight (LB)
2T
33–36
27–30
3T
36–39
30–34
4T
39–42
34–38
5T
42–44
38–44
US Size
Height (IN)
Weight (LB)
XS/6–7
45–48
45–50
S/8–9
49–52
51–65
M/10–12
53–57
66–80
L/13–14
58–62
81–95
XL/15–16
63–66
96–110
*Learn how to find your true waist below.
Please find inseam length on specific product detail page.
Use the guide below with a fabric tape measure to find your measurements.
CHEST
Measure circumference from the widest part around chest, about 1” down from armpit.
SLEEVE
With arm slightly bent, measure from center back neck to shoulder, down arm to wrist bone.
TRUE WAIST
Measure around your natural waist, narrowest part of your torso.
HIP
Measure around the fullest part of your hips.
BUST
Measure circumference from the widest part around chest, about 1" down from armpit.
TRUE WAIST
Measure around your natural waist, narrowest part of your torso.
HIP
Measure around the fullest part of your hips.
Free Returns & Exchanges
If you try it and it doesn't fit, no problem. Returns and exchanges are free and easy.
Learn More
Materials & Care
Material Description: Brushed twill made from upcycled oyster shells and recycled plastic bottles
Material Contents: 57% Cotton / 40% Recycled Seawool Polyester / 3% Spandex
Fabric Weight (GSM): 177
Hang dry
Features
• Classic flannel shirt packed with sneaky performance
• Thermo-regulating, anti-odor, and quick-dry properties perfect for days on the water
• Left chest pocket perfect for stashing your shades
• Curved droptail hem for a flattering fit
• Two-button cuffs for adjustability
Size & Fit
Relaxed through the body for comfort and room to move
Shipping & Returns
Free standard shipping on all orders $150+
Free 30-day returns and 60-day exchanges on U.S. orders for unwashed, unworn items.
Final sale styles are not eligible for return or exchange.
Send gifts wrapped by adding on gift wrap at cart. We also offer free gift messaging.
For over a decade, we've been innovating with natural materials—bamboo, eucalyptus, and now oyster shells—to build our gear. As a family-founded company that lives for the outdoors, supporting our community and protecting our planet’s wild places are absolutely central to Free Fly’s purpose.
Women's Seawool Flannel Shirt - Dark Forest Dark Forest / S
Great seawool flannel shirts
These shirts are comfortable, warm, and true to size. I originally bought the birch plaid for a trip to England in December, where the weather was cold and damp. I liked it so much that I bought the dark forrest and the darker plaid when they were on sale. I wore this shirt over a long-sleeved t-shirt and was plenty warm. The shirt washes well in cold water, wrinkles disappear with a brief tumble in the dryer, and then air dry. No shrinkage noted. I’ll get plenty of wear out of these shirts for our long winters in the midwest and look forward to wearing them in the fall and spring without layering. Highly recommend.
What is your height? 5'4-5'6
What is your weight? 120-140
What size did you purchase? S
For what activity do you recommend this product? Casual Wear, Travel
I have two colors of this shirt and love the way it feels. The size also works perfectly.
What is your height? 5'1-5'3
What is your weight? 180-200
What size did you purchase? L
For what activity do you recommend this product? Casual Wear, Work, Travel, Hiking
Carrie
Verified Reviewer
Rated 5 out of 5 stars
1 month ago
Reviewing
Women's Seawool Flannel Shirt - Fossil Plaid
love this shirt!
The flannel is so soft. I was surprised how roomy the shirt is. I wear a medium in Free Fly shirts and ordered medium in this and it is roomy and longer than my other flannels. For a form fitting shirt, I would size down.
What is your height? 5'4-5'6
What is your weight? 140-160
What size did you purchase? M
For what activity do you recommend this product? Casual Wear, Work, Travel
For what activity do you recommend this product? Casual Wear, Travel
Kathy D.
Verified Buyer
Rated 5 out of 5 stars
2 months ago
Reviewing
Women's Seawool Flannel Shirt - Dark Forest Dark Forest / XL
Love this shirt!
So soft and versatile!
What is your height? 5'10-6'0
What is your weight? 160-180
What size did you purchase? XL
For what activity do you recommend this product? Casual Wear
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One Size Doesn't Fit All
All measurements are in inches and reflect body measurements. If you are in between sizes, size up for comfort.
Got questions? Email us at info@freeflyapparel.com.
Men
Women
Toddler
Youth
Alpha Sizes
Numeric Sizes
Chest
Waist
Hip
Sleeve
S
30–31
36–38
30–32
34–37
32–33
M
32–33
38–40
32–34
37–39
33–34
L
34–35
41–43
35–37
40–42
34–35
XL
36–38
44–46
38–40
43–45
35–36
XXL
40
47–49
41–43
46–48
36–37
3XL
50–52
44–46
49–51
36–37
Alpha Sizes
Numeric Sizes
Bust
Waist
Hip
XS
0–2
32–33
25–26
35–36
S
4–6
34–35
27–28
37–38
M
8–10
36–37
29–30
39–40
L
12–14
38 1/2–40
31 1/2–33
41 1/2–43
XL
16
41 1/2–43
34 1/2–36
44 1/2–46
XXL
44 1/2–46
37 1/2–39
47 1/2–49
US Size
Height (IN)
Weight (LB)
2T
33–36
27–30
3T
36–39
30–34
4T
39–42
34–38
5T
42–44
38–44
US Size
Height (IN)
Weight (LB)
XS/6–7
45–48
45–50
S/8–9
49–52
51–65
M/10–12
53–57
66–80
L/13–14
58–62
81–95
XL/15–16
63–66
96–110
*Learn how to find your true waist below.
Please find inseam length on specific product detail page.