Polartec Level 1 Base Level Thermal Undershirt, Sand Tan Shirt
Price range: $4.99 through $16.99
Not sure what size you are?Sizing Chart
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- Free shipping & returns over $80
Features & Specs
Features:
- ECWCS Level 1
- Part Of ECWCS
- Moisture Wicking
- Breathable
- Lightweight Construction
- Water Resistant
Issue Type: US Army Issue
Manufactured by:
- Various Government Contractors
Country of Manufacture: USA
Description
These are USGI Polartec Level 1 “Silks” Base Layer Shirts. These tops are a component of the 3rd Generation Extreme Cold Weather Clothing System (ECWCS), adopted by the U.S. Army in 2005. The Level 1 is one of seven levels within this system, serving as a general base layer for when temperatures dip into the 40s. Due to its low insulating properties, the Level 1 is best used during activity in cold environments. Warmth is generated by the friction of the clothes moving, which helps keep you warm when paired with appropriate outerwear. The USGI Polartec Level 1 Shirts are constructed from Polartec material, which is lightweight, breathable, and moisture-wicking. Additionally, these shirts feature stretch material and elastic cuffs for a comfortable fit. Overall, these shirts are a simple yet staple item that has served as the foundation of the U.S. Army’s Extreme Cold Weather Clothing System since 2005. So, whether you need a fresh top for duty or are just looking for a solid starting point for your cold weather kit, the USGI Level 1 Base Layer Shirt is for you!
Features:
- ECWCS Level 1 – These are base layers meant to be worn in a variety of temperatures and form the base for all ECWCS layers. Material is quick drying, moisture wicking, breathable and lightweight. Layers consist of a top and bottom that are typically tight fitting to help with insulation as well as breathability.
- Part Of ECWCS – This is part of the US Army Extended Cold Weather Clothing System that is used to protect the wearer from cold to extreme cold weather situations and environments. The system consists of 7 levels of clothing and various accessories that can be worn in multiple configurations. When worn properly in appropriate conditions the system is designed to keep Soldiers warm in temperatures from +40 degrees to -50 degrees Fahrenheit.
- Moisture Wicking – Garment wicks away moisture which decreases drying time of the material and less soaking.
- Breathable – Breathable means it allows moisture to escape to help keep the wear dry even when sweating.
- Lightweight Construction – Built with lightweight materials for extended use.
- Water Resistant – It can be exposed to water for a short period of time without being damaged or saturated with water. Generally not recommended to submerge Water Resistant items unless item is made for that level of exposure.
Manufactured by:
- Various Government Contractors – This item is manufactured for the US government by various contractors.
Country of Manufacture: USA – This product is manufactured in the #1 country, the USA.
Issue Type: US Army Issue – This item is genuine US Army issue.
Item Details
Product FAQ (2)
Customer Product Questions and Answers
- Wondering the same and it’s most likely a thin/smooth polyester, that’s what it looks like.
- Q Wondering the same and it’s most likely a thin/smooth polyester, that’s what it looks like.Asked by on January 7, 2025 7:04 pmThere are no answers for this question yet. Answer now What material(s) is this made out of? Merino wool, polyester, etc.? What percentage of each material?
- Q What material(s) is this made out of? Merino wool, polyester, etc.? What percentage of each mater...... Read more answer nowAsked by on January 7, 2025 5:00 pmA Wondering the same and it’s most likely a thin/smooth polyester, that’s what it looks like and what is typically used.A
Polartec Level 1 Base Layers are constructed of 100% Polyester.
4 reviews for Polartec Level 1 Base Level Thermal Undershirt, Sand Tan Shirt
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US Military clothing in general runs in BDU sizing. If you are unsure about your proper size, this chart will help you find your general shirt size, unless otherwise noted in the description.
| Size | Chest | Height | Sleeve |
|---|---|---|---|
| XS Short | 29-32 | 63-67 | 23 3/4 |
| XS Regular | 29-32 | 67-71 | 24 1/4 |
| XS Long | 29-32 | 71-75 | 25 3/4 |
| Small Short | 33-36 | 63-67 | 23 3/4 |
| Small Regular | 33-36 | 67-71 | 24 3/4 |
| Small Long | 33-36 | 71-75 | 25 3/4 |
| Medium Short | 37-40 | 63-67 | 24 1/4 |
| Medium Regular | 37-40 | 67-71 | 25 1/4 |
| Medium Long | 37-40 | 71-75 | 26 1/4 |
| Large Short | 41-44 | 63-67 | 24 3/4 |
| Large Regular | 41-44 | 67-71 | 25 3/4 |
| Large Long | 41-44 | 71-75 | 26 3/4 |
| XL Short | 45-48 | 63-67 | 24 3/4 |
| XL Regular | 45-48 | 67-71 | 26 1/4 |
| XL Long | 45-48 | 71-75 | 27 1/4 |
| XXL Regular | 49-52 | 67-71 | 26 3/4 |
| XXL Long | 49-52 | 71-75 | 27 3/4 |
| 3XL Regular | 53-56 | 67-71 | 27 1/4 |
| 3XL Long | 53-56 | 71-75 | 28 1/4 |
| 4XL Regular | 57-60 | 67-71 | 27 3/4 |
US Military clothing in general runs in BDU sizing. If you are unsure about your proper size, this chart will help you find your general pant size, unless otherwise noted in the description.
| Size | Waist | Inseam |
|---|---|---|
| XS Short | 23-27 | 26 1/2 - 29 1/2 |
| XS Regular | 23-27 | 29 1/2 - 32 1/2 |
| XS Long | 23-27 | 32 1/2 - 35 1/2 |
| Small Short | 27-31 | 26 1/2 - 29 1/2 |
| Small Regular | 27-31 | 29 1/2 - 32 1/2 |
| Small Long | 27-31 | 32 1/2 - 35 1/2 |
| Medium Short | 31-35 | 26 1/2 - 29 1/2 |
| Meduim Regular | 31-35 | 29 1/2 - 32 1/2 |
| Medium Long | 31-35 | 32 1/2 - 35 1/2 |
| Large Short | 35-39 | 26 1/2 - 29 1/2 |
| Large Regular | 35-39 | 29 1/2 - 32 1/2 |
| Large Long | 35-39 | 32 1/2 - 35 1/2 |
| XL Short | 39-43 | 26 1/2 - 29 1/2 |
| XL Regular | 39-43 | 29 1/2 - 32 1/2 |
| XL Long | 39-43 | 32 1/2 - 35 1/2 |
| XXL Regular | 43-47 | 29 1/2 - 32 1/2 |
| XXL Long | 43-47 | 32 1/2 - 35 1/2 |
| 3XL Regular | 47-51 | 29 1/2 - 32 1/2 |
| 3XL Long | 47-51 | 32 1/2 - 35 1/2 |
| 4XL Regular | 51-55 | 29 1/2 - 32 1/2 |




Josh (verified owner) –
Ordered this last week and it came within 4 days. Great quality, awesome customer service, fast shipping.
g49o2 (verified owner) –
Fast and friendly service from Venture Surplus again. Great product, nearly perfect. The sleeves would need to be about an inch-and-a-half longer before I would be able to get my thumbs comfortably into the thumb holes. But as a tall, skinny guy I am used to things being just a little short. I don’t think I would use the thumb holes very much anyway.
Gil LeBlanc (verified owner) –
MADE IN USA PROUD, excellent base layer, ordered 2XLXL, loose fit I’m 5’11” and 250lbs, very comfortable with sleeves and thumb hole perfect length, ordered the drawers in XLXL, will review when rec’d, thank you Venture Surplus with your excellent service and fast shipping, son of a KOREAN WAR ARMY VET-I’m very proud to be a humble civilian.
Al (verified owner) –
Great job. I bought a few items. The Level I undershirts were in fantastic condition. They were clean. They were packaged really well. They were delivered quickly. A retailer in 2025 that goes above what’s required to do an excellent job. Outstanding.