FREE shipping on all orders $74.95 and over.

Enable Accessibility

Search suggestions:

Search Best Sellers

  • Obsidian Black (001) Obsidian Black (001) Obsidian Black (001) Obsidian Black (001) Obsidian Black (001) Obsidian Black (001) Obsidian Black (001) Obsidian Black (001) Obsidian Black (001)
    Polar Trex™ Winter Dog Boots colors

    Polar Trex™ Winter Dog Boots

    winter traction & insulation

    4.3
    Rated 4.3 out of 5 stars
    335 Reviews
    Original price $54.95 USD
  • Blaze Orange (850) Blaze Orange (850) Front Range Harness in Basalt Gray (042) Front Range Harness in River Rock Green (355) Blue Pool (410) Red Canyon (625) Moonlight Mountains (964) Spring Mountains (968) Coastal Mountains (973) Blaze Orange (850) Front Range Harness in Basalt Gray (042) Front Range Harness in River Rock Green (355) Blue Pool (410) Red Canyon (625) Moonlight Mountains (964) Spring Mountains (968) Coastal Mountains (973) Blaze Orange (850) Front Range Harness in Basalt Gray (042) Front Range Harness in River Rock Green (355) Blue Pool (410) Red Canyon (625) Moonlight Mountains (964) Spring Mountains (968) Coastal Mountains (973) Blaze Orange (850) Front Range Harness in Basalt Gray (042) Front Range Harness in River Rock Green (355) Blue Pool (410) Red Canyon (625) Moonlight Mountains (964) Spring Mountains (968) Coastal Mountains (973) Blaze Orange (850) Front Range Harness in Basalt Gray (042) Front Range Harness in River Rock Green (355) Blue Pool (410) Red Canyon (625) Moonlight Mountains (964) Spring Mountains (968) Coastal Mountains (973)
    Front Range® Dog Harness colors

    Front Range® Dog Harness

    padded, everyday adventure

    4.8
    Rated 4.8 out of 5 stars
    4,031 Reviews
    Original price $54.95 USD
  • Strata (962) Blue Jay (437) Galaxy (954) Strata (962) Blue Jay (437) Galaxy (954) Strata (962) Blue Jay (437) Galaxy (954) Strata (962) Blue Jay (437) Galaxy (954) Strata (962) Blue Jay (437) Galaxy (954) Strata (962) Blue Jay (437) Galaxy (954) Strata (962)
    Climate Changer™ Dog Fleece colors

    Climate Changer™ Dog Fleece

    technical, breathable fleece

    4.7
    Rated 4.7 out of 5 stars
    442 Reviews
    Original price $59.95 USD
  • UP TO 25% off
    Fireweed Pink (627) Blue Moon (460) Campfire Orange (815) Blue Moon (460) Campfire Orange (815) Blue Moon (460) Campfire Orange (815) Blue Moon (460) Campfire Orange (815) Blue Moon (460) Campfire Orange (815) Blue Moon (460) Campfire Orange (815) Obsidian Black (001) River Rock Green (355) Fireweed Pink (627) Obsidian Black (001) River Rock Green (355) Fireweed Pink (627) Obsidian Black (001) River Rock Green (355) Fireweed Pink (627) Obsidian Black (001) River Rock Green (355) Fireweed Pink (627) Obsidian Black (001) River Rock Green (355) Fireweed Pink (627) Obsidian Black (001) River Rock Green (355) Fireweed Pink (627)
    Quinzee™ Dog Puffer Jacket colors

    Quinzee™ Dog Puffer Jacket

    packable & insulated

    4.8
    Rated 4.8 out of 5 stars
    345 Reviews
    From $56.21 USD - $89.95 USD $56.21 USD - $89.95 USD
Aurora Teal
Aurora Teal
Aurora Teal
Aurora Teal
Aurora Teal
Aurora Teal
Aurora Teal
Aurora Teal
Campfire Orange
Campfire Orange
Campfire Orange
Campfire Orange
Campfire Orange
Campfire Orange
Campfire Orange
Campfire Orange
50% off
4.6
Rated 4.6 out of 5 stars
110 Reviews

Undercoat™ Dog Water Jacket

water-friendly insulation

Color

Selected: Aurora Teal

Choose size

Sizing Chart

Measurement is around the widest part of the rib cage. This style is Formfitting, meaning that it is snug and conforms to the body’s contours. In between sizes? Choose the larger size.

Product sizing chart table
Girth Size
13 - 17 in (33 - 43 cm) XXS
17 - 22 in (43 - 56 cm) XS
22 - 27 in (56 - 69 cm) S
27 - 32 in (69 - 81 cm) M
32 - 36 in (81 - 91 cm) L
36 - 42 in (91 - 107 cm) XL
Product Dimensions Figure
Product dimensions table
Length (A) Neck (B) Size
11 in (27.5 cm) 10.5 - 11.75 in (26.5 - 30 cm) XXS
14 in (35.5 cm) 13 - 15 in (33 - 38 cm) XS
18.5 in (47 cm) 15 - 17.5 in (38 - 44.5 cm) S
20.75 in (53 cm) 18 - 20.75 in (45.5 - 52.5 cm) M
22.75 in (58 cm) 22 - 24.5 in (56 - 62 cm) L
26 in (66 cm) 26 - 28.5 in (66 - 72.5 cm) XL
Shipping box icon.

Free Returns

 Leaf icon.

Better With Each Design

 Trail Tested Promise icon

Trail Tested Promise
Right Arrow

When it comes to exploring in and around water, the Undercoat™ Water Jacket offers warmth for dogs who can't resist making a splash in the colder, shoulder seasons or who are prone to getting cold when wet. It's an amphibious jacket that thrives in wet environments, using a formfitting laminated neoprene for insulation that stretches and moves with dogs as they romp and swim. Super-soft, articulated stretch StormSleeves™ are engineered to seal in warmth while maintaining freedom of movement.

Can be worn standalone as an insulative piece, or layered under the Float Coat™ Life Jacket if buoyancy is also needed.

WATER-FRIENDLY WARMTH

Laminated neoprene body is flexible and provides insulation in wet environments.

STRETCH SLEEVES

Articulated stretch StormSleeve™ seals in warmth and allows for natural swimming motion.

DRAINAGE HOLES

Small drain holes on belly panel allow water to exit.

Additional Features

  • Formfitting with a zippered closure and sleeves for core heat retention

  • Laminated neoprene body is flexible and provides insulation in wet environments

  • Small drain holes on belly panel allow water to exit

  • Articulated stretch StormSleeve™ seals in warmth and allows for natural swimming motion

  • Reflective trim for visibility in low-light conditions and light loop for attaching The Beacon™️

  • Materials

    • Body: 1mm neoprene laminated with stretch spandex fabric
    • Zipper: YKK Vislon Zipper
    • Reflective trim
    • Zipper flap: 200 denier polyester
    • StormSleeve™: Double-layer stretch spandex
    • Made in Vietnam

  • Care

    • Secure fasteners
    • Rinse with cold water after each use
    • Hang to dry
    • Do not bleach, iron, or dry clean

Undercoat™ Videos

  • About: The Undercoat™ Water Jacket

    Learn more about the Undercoat™ Water Jacket from Alli and Firnspiegel.

Find The Right Size For Your Dog

Measurement is around the widest part of the rib cage.

Sizing Chart & Technical Specs

Measurement is around the widest part of the rib cage. In between sizes? Choose the larger size.

FIT GUIDE

While each style of Ruffwear apparel is designed for its intended use, this guide generalizes our fits in three ways. The Undercoat is Formfitting with a zippered closure and sleeves for core heat retention

Fit guide table
Formfitting Regular Fit Relaxed Fit
Snug and conforms to the body’s contours. Can be worn standalone or layered under Relaxed apparel. Tailored with a bit of wiggle room. Can be worn standalone or layered under Relaxed apparel. A loose fit that drapes the body. Can be worn standalone or over Regular or Formfitting apparel. Works well for hard-to-fit dog shapes and sizes.
Product sizing chart table
Girth Size
13 - 17 in (33 - 43 cm) XXS
17 - 22 in (43 - 56 cm) XS
22 - 27 in (56 - 69 cm) S
27 - 32 in (69 - 81 cm) M
32 - 36 in (81 - 91 cm) L
36 - 42 in (91 - 107 cm) XL
Product Dimensions Figure
Product dimensions table
Length (A) Neck (B) Size
11 in (27.5 cm) 10.5 - 11.75 in (26.5 - 30 cm) XXS
14 in (35.5 cm) 13 - 15 in (33 - 38 cm) XS
18.5 in (47 cm) 15 - 17.5 in (38 - 44.5 cm) S
20.75 in (53 cm) 18 - 20.75 in (45.5 - 52.5 cm) M
22.75 in (58 cm) 22 - 24.5 in (56 - 62 cm) L
26 in (66 cm) 26 - 28.5 in (66 - 72.5 cm) XL
Find The Right Size For Your Dog chart
Select Size

17-22 in (43-56 cm)

Ratings & Reviews

4.6
Rated 4.6 out of 5 stars
Based on 110 reviews
Total 5 star reviews: 80 Total 4 star reviews: 21 Total 3 star reviews: 8 Total 2 star reviews: 1 Total 1 star reviews: 0
Slide 1 selected
Write a Review (Opens in a new window)
110 reviews
  • Favia F.
    Verified Buyer
    Reviewing
    Undercoat™ Dog Water Jacket Small / Aurora Teal (421)
    I recommend this product
    Rated 5 out of 5 stars
    12 seconds ago
    Keeps Osa warm

    Osa loves the water and doesn't know when to stop playing when she is cold. This give her extra comfort and makes me feel better. Keeps her warm. It fits under her PFD nicely. The color is adorable on her as well.

    Was this helpful?
  • Molly G.
    Verified Buyer
    Reviewing
    Undercoat™ Dog Water Jacket XSmall / Campfire Orange (815)
    I recommend this product
    Rated 5 out of 5 stars
    1 hour ago
    Fits nicely!

    Was concerned that an XS would be too small, especially since it has sleeves. But our dog’s Ruffwear harness and raincoat are XS so we ordered accordingly. The undercoat and PFD both fit, even on a short-legged and slightly chonky dog!

    Was this helpful?
  • Richie N.
    Verified Buyer
    Reviewing
    Undercoat™ Dog Water Jacket Large / Campfire Orange (815)
    I recommend this product
    Rated 5 out of 5 stars
    2 days ago
    Undercoat

    Great coat!

    Was this helpful?
  • Katie O.
    Verified Buyer
    Reviewing
    Undercoat™ Dog Water Jacket Medium / Aurora Teal (421)
    I recommend this product
    Rated 5 out of 5 stars
    2 days ago
    Warm on the River

    This will be absolutely perfect for our snake river trip this year! The water does get cold even when you’re in the sun and this little wet suit will be great insulation under Tuesday’s float coat!

    Was this helpful?
  • Trudy F.
    Verified Buyer
    Reviewing
    Undercoat™ Dog Water Jacket Medium / Campfire Orange (815)
    I recommend this product
    Rated 5 out of 5 stars
    5 days ago
    Undercoat and float coat

    We love this product! Got both the undercoat and the float coat! The float coat allows for normal movement while swimming and the undercoat works great for Lake Superior swimming with the water so cold!

    Love these products! We feel they run a bit large and needed to exchange one set for Gracie. Winnie’s fit well. Thanks ruffwear!

    Was this helpful?
Show More