Cooling Vests

A practical and effective solution to combat heat stress in high-temperature environments.

Stay cool, stay ready

First Line Technology’s Cooling Vests provide immediate and sustained cooling for users in extreme conditions. These vests help maintain safety, performance, and focus for first responders, military personnel, and industrial workers.

Cooling Vests are trusted worldwide to combat heat stress and ensure peak performance.

Frequently Asked Questions

Here are some common questions about our products and how they support disaster preparedness and emergency response.

What is PhaseCore?

PhaseCore elements are made of a nontoxic, non-flammable salt mixture sealed inside a thermal wrapper. PhaseCore is a phase change material (PCM) that produces a cooling effect by transforming from a solid state to a liquid state when the temperature rises above its activation point. PhaseCore elements are not affected by humidity and react only to direct heat.

How Do PhaseCore Personal Cooling Vests Work?

First Line’s PhaseCore personal cooling vests respond to your body temperature and emit a gentle cooling effect. The lightweight design makes it a versatile cooling vest that is easy to wear under clothing and gear. Recharge at Room Temperature. No Need for Refrigeration; PhaseCore elements can be easily recharged for 1000+ uses.

How Do I Recharge PhaseCore Elements?

Once PhaseCore elements transform from a solid state to a liquid state, the elements must be recharged. PhaseCore elements can be recharged by storing the element in an environment less than the activation point. PhaseCore elements can be recharged more quickly in colder environments. Refrigeration is not required but will make the recharge period shorter. PhaseCore elements are completely recharged when they return to a solid state.

Why are PhaseCore Cooling Vests Better than Ice, Gel and Other Frozen Liquid Cooling Vests?

Unlike ice, gel, and other frozen liquids, PhaseCore does not over-cool or shock the body. Over-cooling the body does not provide for the best cooling solution because the body reacts to ice cold on the skin by generating heat in the body core to compensate for cold sensation on the skin. PhaseCore gently cools and maintains the body’s core temperature by cooling at a temperature that will not cause the body to generate heat.

Which Vest is Best for Me?

Standard Mesh vests fit persons ranging from a Small – 2XL. If you add standard mesh extenders it increases size from 2XL – 5XL. The standard mesh also has adjustable shoulder straps for those individuals who need to adjust for height (short and tall). The Standard Mesh also comes in XS size for petite persons and children up to size 115lbs and 5’5”.

The XPC vest is adjustable with zipper extenders allowing persons sized from Small/Medium to 3XL. There are multiple ways to extend the sizes to make sure this vest fits you the best. You want to have the vest be snug but not restrictive.

How Should I Travel With My Vest?

If you are flying with your vest – please take the information provided and travel smart with your PhaseCore Vest. PLEASE DO NOT wear it through security at their airport or sporting event. Place your vest inside your carry-on or checked luggage. Your bags will be scanned most likely and pulled for extra security review so please take extra time into consideration when traveling. Keep a set of instructions next to the vest and explain to the security agent that this is a Cooling Vest and its used as a medical device. If you would like some more documentation – TSA provides a “Disability Notification Card” by going to this website: https://www.tsa.gov/sites/default/files/disability_notification_card_508.pdf and printing this out prior to travel.

If you are traveling long distances, please take a look into our Transport Bag which will keep your vest and elements cool up to 8 hours in 95F. If you are traveling with these Blue Ice packs in the Transport Bag they will need to be frozen solid prior if they are a carry on or they might be thrown away.

Can I Return My Vest?

If you any reason you may need to return a vest once purchased you may do so. Please refer to First Line Technology’s Warranty, Returns & Exchange policy.

Cooling Vests Products

Explore innovative cooling vest solutions for peak performance and safety

PhaseCore 28 Elements

Use Cases

Documents and Resources

Explore a collection of detailed data sheets, videos, and safety information (SDS) for all First Line Technology products. From decontamination solutions like Dahlgren Decon to innovative tools for emergency response, find the resources you need to support your mission effectively.