Seac Undersuit Unifleece Drysuit Undergament
In stock — ships from Irvine, CA
This item is currently on backorder. Order now to reserve yours, and we will ship it as soon as it is back in stock.
Seac Undersuit Unifleece Drysuit Undergament - L (Large) is backordered and will ship as soon as it is back in stock.
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All Seac size charts on one page. Imperial in bold, metric underneath.
Men’s wetsuits
Seac men's diving wetsuits
| Man | Height ft/in · cm |
Weight lb · kg |
Chest in · cm |
|---|---|---|---|
| S |
5′5″–5′9″ 166–175 |
121–150 55–68 |
34.6–36.2 88–92 |
| M |
5′7″–5′10″ 170–178 |
141–172 64–78 |
37–39.4 94–100 |
| L |
5′9″–6′0″ 176–184 |
165–194 75–88 |
38.6–40.9 98–104 |
| XL |
5′10″–6′2″ 178–189 |
185–214 84–97 |
40.2–43.3 102–110 |
| 2XL |
6′1″–6′4″ 186–194 |
203–238 92–108 |
42.9–45.7 109–116 |
| 3XL |
6′4″–6′6″ 192–198 |
240–260 109–118 |
44.9–47.2 114–120 |
| 4XL |
6′4″–6′8″ 193–202 |
243–260 110–118 |
45.7–48.8 116–124 |
Seac men's freediving and spearfishing wetsuits
| Man | Height ft/in · cm |
Weight lb · kg |
Chest in · cm |
|---|---|---|---|
| S |
5′5″–5′9″ 166–175 |
121–150 55–68 |
34.6–36.2 88–92 |
| M |
5′7″–5′10″ 170–178 |
141–172 64–78 |
37–39.4 94–100 |
| L |
5′9″–6′0″ 176–184 |
165–194 75–88 |
38.6–40.9 98–104 |
| XL |
5′10″–6′2″ 178–189 |
185–214 84–97 |
40.2–43.3 102–110 |
| 2XL |
6′1″–6′4″ 186–194 |
203–238 92–108 |
42.9–45.7 109–116 |
| 3XL |
6′4″–6′6″ 192–198 |
240–260 109–118 |
44.9–47.2 114–120 |
Women’s wetsuits
Seac women's diving wetsuits
| Lady | Height ft/in · cm |
Weight lb · kg |
Chest in · cm |
|---|---|---|---|
| XS |
5′1″–5′3″ 155–161 |
115–128 52–58 |
30.3–32.7 77–83 |
| S |
5′3″–5′5″ 160–166 |
126–139 57–63 |
32.3–34.6 82–88 |
| M |
5′5″–5′7″ 165–171 |
137–157 62–71 |
34.3–36.2 87–92 |
| L |
5′8″–5′10″ 172–178 |
148–165 67–75 |
37–38.6 94–98 |
| XL |
5′10″–6′0″ 177–183 |
165–183 75–83 |
38.2–40.2 97–102 |
| 2XL |
5′10″–6′1″ 179–185 |
185–203 84–92 |
39.4–41.7 100–106 |
Drysuits
Seac men's drysuits
Height, weight and chest
| Man | Height ft/in · cm |
Weight lb · kg |
Chest in · cm |
|---|---|---|---|
| S |
5′5″–5′9″ 166–175 |
121–150 55–68 |
34.6–36.2 88–92 |
| M |
5′7″–5′10″ 170–178 |
141–172 64–78 |
37–39.4 94–100 |
| L |
5′9″–6′0″ 176–184 |
165–194 75–88 |
38.6–40.9 98–104 |
| L2P |
5′9″–6′0″ 176–184 |
176–203 80–92 |
39.4–43.3 100–110 |
| XL |
5′10″–6′2″ 178–189 |
185–214 84–97 |
40.2–43.3 102–110 |
| XL2P |
5′10″–6′2″ 178–189 |
212–229 96–104 |
42.5–45.7 108–116 |
| 2XL |
6′1″–6′4″ 186–194 |
203–238 92–108 |
42.9–45.7 109–116 |
| XXL2P |
6′1″–6′4″ 186–194 |
225–251 102–114 |
44.1–47.2 112–120 |
| 3XL |
6′4″–6′6″ 192–198 |
240–260 109–118 |
44.9–47.2 114–120 |
| XXXL2P |
6′4″–6′6″ 192–198 |
247–265 112–120 |
45.3–48.4 115–123 |
| 4XL |
6′4″–6′8″ 193–202 |
249–282 113–128 |
45.7–51.2 116–130 |
Boots
| Man | Boots |
|---|---|
| S | 40–41 |
| M | 41–42 |
| L | 42–43 |
| L2P | 42–43 |
| XL | 43–44 |
| XL2P | 43–44 |
| 2XL | 44–45 |
| XXL2P | 44–45 |
| 3XL | 45–46 |
| XXXL2P | 45–46 |
| 4XL | 46/47 |
Hoods, boots and gloves
Seac hoods, footwear and gloves
Hoods
| Hood size | Head circumference in · cm |
|---|---|
| XS |
20.9–21.3 53–54 |
| S |
21.6–22 55–56 |
| M |
22.4–22.8 57–58 |
| L |
23.2–23.6 59–60 |
| XL |
24–24.4 61–62 |
| 2XL |
24.8–25.1 63–64 |
| 3XL |
25.6–26 65–66 |
Footwear
| Footwear size | Foot length in · cm |
|---|---|
|
2XS EU size 36–37 · US size 4–4.5 · UK size 4–4.5 |
9 23 |
|
XS EU size 37–38 · US size 4.5–5.5 · UK size 4.5–5.5 |
9.4 24 |
|
S EU size 38–39 · US size 5.5–6.5 · UK size 5.5–6.5 |
9.8 25 |
|
M EU size 40–41 · US size 7–8 · UK size 7–7.5 |
10.2 26 |
|
L EU size 42–43 · US size 8.5–9.5 · UK size 8–9 |
10.6 27 |
|
XL EU size 43–44 · US size 10–11 · UK size 9–10 |
11 28 |
|
2XL EU size 45–46 · US size 11.5–12.5 · UK size 11–11.5 |
11.4 29 |
|
3XL EU size 47–48 · US size 12.5–13 · UK size 12.5–13 |
11.8 30 |
For the most accurate fit, we recommend referring to the foot length indicated in the size chart.
Gloves
| Glove size | EU size | Palm circumference in · cm |
|---|---|---|
| 2XS | 5 |
7.00–7.48 17.5–19 |
| XS | 6 |
7.48–8.07 19–20.5 |
| S | 7 |
8.07–8.66 20.5–22 |
| M | 8 |
8.66–9.25 22–23.5 |
| L | 9 |
9.25–9.84 23.5–25 |
| XL | 10 |
9.84–10.43 25–26.5 |
| 2XL | 11 |
10.43–11.02 26.5–28 |
Fins
Seac F100 Pro fins
| Size EU | Size UK | Size US | Weight lb · g |
Fin length (A) in · cm |
|---|---|---|---|---|
| 36/37 | 4/4.5 | 4/5 |
1.31 593 |
22.44 57 |
| 38/39 | 5.5/6.5 | 6/6.5 |
1.28 580 |
22.44 57 |
| 40/41 | 7/7.5 | 7/8 |
1.56 707 |
24.21 61.5 |
| 42/43 | 8/9 | 8.5/9.5 |
1.85 839 |
25.59 65 |
| 44/45 | 10/11 | 10/11 |
2.03 923 |
26.37 67 |
| 46/47 | 11.5/12.5 | 12/12.5 |
2.07 940 |
26.37 67 |
* The indicated weight refers to a single fin
Seac F1 fins
| Size | EU size | Foot length (A) in · cm |
Weight lb · g |
Fin length (B) in · cm |
|---|---|---|---|---|
| XS/S | 36/38 |
8.6–9.5 22–24 |
1.66 753 |
24.01 61 |
| S/M | 39/41 |
9.5–10.2 24–26 |
1.74 789 |
24.01 61 |
| M/L | 42/43 |
10.2–11 26–28 |
1.80 815 |
25.19 64 |
| L/XL | 45/47 |
11.4–12.2 29–31 |
2.11 955 |
26.37 67 |
From Seac’s chart: * The indicated weight refers to a single fin
Seac Propulsion fins
| Size | Weight lb · g |
Fin length (A) in · cm |
|---|---|---|
|
S/M Size EU 39/41 · Size UK 6.5–7.5 · Size US 6.5–8 |
1.88 852 |
24.40 62 |
|
M/L Size EU 42/44 · Size UK 8.5/10 · Size US 8.5/10 |
2.22 1009 |
26.37 67 |
|
L/XL Size EU 45/47 · Size UK 11/12.5 · Size US 11/12.5 |
2.56 1163 |
27.16 69 |
From Seac’s chart: The indicated weight refers to a single fin The sizes are indicatives and depends at the socks you want to wear
Seac Motus fins
| Size EU | Size UK | Size US | Weight lb · g |
Fin length (A) in · cm |
|---|---|---|---|---|
| 35/36 | 3/4 | 3/3.5 |
2.09 948 |
33.07 84 |
| 36/38 | 3.5/5 | 4.5/5.5 |
2.09 948 |
33.07 84 |
| 39/40 | 5.5/6.5 | 6.5/7 |
2.13 965 |
33.85 86 |
| 41/42 | 7/8 | 8/8.5 |
2.14 972 |
34.25 87 |
| 43/44 | 8.5/9.5 | 9.5/10 |
2.19 993 |
34.64 88 |
| 45/46 | 10/11 | 10/11 |
2.35 1064 |
35.43 90 |
| 47/48 | 12/13 | 12.5/13.5 |
2.51 1138 |
35.82 91 |
From Seac’s chart: * The indicated weight refers to a single fin
Seac Talent fins
| Size EU | Size UK | Size US | Weight lb · g |
Fin length (A) in · cm |
|---|---|---|---|---|
| 35/36 | 3/4 | 3/3.5 |
2.09 948 |
33.07 84 |
| 36/38 | 3.5/5 | 4.5/5.5 |
2.09 948 |
33.07 84 |
| 39/40 | 5.5/6.5 | 6.5/7 |
2.13 965 |
33.85 86 |
| 41/42 | 7/8 | 8/8.5 |
2.14 972 |
34.25 87 |
| 43/44 | 8.5/9.5 | 9.5/10 |
2.19 993 |
34.64 88 |
| 45/46 | 10/11 | 10/11 |
2.35 1064 |
35.43 90 |
| 47/48 | 12/13 | 12.5/13.5 |
2.51 1138 |
35.82 91 |
From Seac’s chart: * The indicated weight refers to a single fin
Source: Seac’s size chart (original chart 1, original chart 2, original chart 3, original chart 4, original chart 5, original chart 6, original chart 7, original chart 8, original chart 9) and Seac’s current size chart. Where the chart prints only one unit, we converted the other: inches from centimeters (to the nearest 0.1″); feet and inches from centimeters (to the nearest inch); pounds from kilograms (to the nearest pound).
Payment & Security
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Product Information
The Seac Undersuit Unifleece Drysuit Undergament is a lightweight, breathable undergarment designed for use under a drysuit during scuba diving in cold water. It combines a soft, two-layer fabric with a water-repellent outer surface to help you stay warm and dry beneath your diving gear. A double-ended front zipper and ankle stirrups enable smooth donning and minimize bunching, while easy-access pockets provide storage for essentials during dives.
- Lightweight, breathable, 2-layer undergarment keeps you warm while diving in cold environments
- Outer layer repels water to help keep you dry during scuba adventures
- Double-Ended front zipper facilitates quick entry and exit
- Ankle stirrups prevent bunching when putting on your drysuit for a snug fit
- Easy-access zippered pockets provide storage for essential diving gear
⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.

















