How does a Hydro Flask keep water cold?

Hydro Flask Australia Construction
Cross-section of Hydro Flask
Image above is a 32oz wide mouth bottle available is heaps of colours.

It’s no secret that Hydro Flask water bottles and coffee mugs are popular at the moment. Here at Southern Man, we have been getting lots of enquiries like “How does the Hydro Flask keep water cold?”, “What is the best stainless steel water bottle on the market?” and “What’s so special about hydro flasks?” so we have decided to put together some information about why we love Hydro Flask!

It’s true; Hydro Flask Bottles do keep your water icy cold for a long time. We have heard lots of stories from our customers, but some that stand out are:

  • We had they have put ice and water in their bottle, left it in their hot car for the day and in the afternoon there was still ice. 
  • Another customer put tap water in their bottle and put it in the fridge, expecting it to cool the water down overnight. In the morning, the water was still room temperature as the insulation had worked in reverse.
  • A different customer told us they put hot coffee in their mug at 5 am and it’s still water at 10 am on their work break. 

These are just a few examples of how well the construction of the hydro flask bottles retain the temperature of what you put in there. They do this by TempShield™, which is their double-wall, vacuum insulated technology that guards the temperature of your drink. 

Another question we get a lot is “Are hydro flasks good water bottles or just another trend?” We think they are famous because they are built well and they live up to the hype. Usually, our customers will purchase one drink bottle, and then they will come back and purchase a coffee cup, another size or by one for a friend. Hydro Flask says to test bringing ice water with you in the morning, and they promise till will still back cold in the afternoon. Or put hot coffee in there, and it will keep it warm until you’re ready. Hydro Flask also guarantees no condensation or heat transfer to the outside of the bottle.

Temperature insulation is not the only thing TempShield™ provides. TempShield™ double-wall insulation protects temperature from the outside elements. Cold drinks stay freezing cold up to 24 hours. Hot stays really hot up to 6-12 hours with no sweat on the outside of the bottles.

Let’s dive a bit deeper into Hydro Flask’s Tempshield. 


  • Their proprietary bottom seal creates a secure vacuum
  • Eliminates the need for a bulky bottom cap to seal the flask
  • This means they can make the lightest weight bottles in the insulated hydration category

Slim Profile:

  • Their specially formulated getter (a small metal disk located between the two walls) absorbs all moisture and gas during the vacuum process
  • Allows them to have thinner walls without losing performance
  • This also gives Hydro Flask a slimmer, more streamlined design

Guaranteed for a Lifetime:

  • Hydro Flask has its dedicated manufacturing ovens to ensure control over the entire production process of making each bottle
  • This creates high quality and consistency that leads to the best product.

Along with their TempShield™ allowing for the lightest and slimmest insulated bottle, their powder coat adds grip and durability – so you can take your Hydro Flask anywhere, on any adventure. Hydro Flask offers a wide range of refreshingly bold colours as unique as you are. Check out the range to find the one that’s right for you. 

All of their amazing products are made with 18/8 pro-grade stainless steel. This is a metal recognized for its strength and purity. It also protects against flavour transfer, so today’s IPA won’t taste like yesterday’s margarita, and you won’t be asking how to get the metallic smell out of my stainless steel bottle?

HydroFlask Lid Cross Section
Hydro Flask Lids
Built to keep water cool and coffee hot.
HydroFlask Flex Cap
Flex Cap Lids
Come standard with any Hydro Flask Bottle
Hydro Flask Lid
Perfect Handle
Confortable handle to hold your hydro flask.

We love all the accessories to go with your hydro flask. If you have the standard mouth bottle, get the sports cap lid, you will be sipping chilled water easier. If you have a wide mouth bottle, get the straw lid. The straws can be cut down to size to fit all wide mount bottles. Change the look of your bottle by purchasing any of the different colour boots. The boots look awesome and provide protection and non-slip base to the bottle. Four colours are available, black, cobalt, olive and watermelon. We really like the pacific bottle and the cobalt boot or lilac bottle with watermelon boot. 

What’s so special about Hydro Flask?

Hydro Flask are well-insulated drinkware great for travelling. Its bottles maintain beverage temperature for hours, and they’re durable and easy to carry. They come in a massive variety of styles, colours and sizes.

Is Hydro Flask better than Yeti?

The one edge that Hydro Flask may have over Yeti is that in our tests the YETI bottles are more durable, slightly. … Also, we like the lid on the Hydro Flask bottles better. It has a the strap-style on instead of a solid handle on the Yeti.

Does Hydroflask have a lifetime warranty?

They guarantee every Hydro Flask® product with a limited warranty against manufacturer defects! Hydro Flask will replace any eligible product found to be defective within normal and appropriate use. 

They have water bottles available in 12 oz up to 64 oz. They even offer a 128 oz option, which is the biggest Hydro Flask offered. However, the most common sizes are the 32 oz, 18 oz and 21 oz bottles.

Will Hydroflask replace a dented bottle?

Although Hydro Flask warranty doesn’t cover regular wear and tear, such as scratches, dents, powder coat chips from the flask being dropped, it does cover manufacturing defects, such as the insulation fails or wrongly made leaking caps.

Are there fake Hydro Flask?

The flasks purchased from us are authentic and genuine Hydro Flask products. They have the Hydro Flask sleeve listing the Hydro Flask information (product information, lifetime warranty etc.

Hydroflask Water Bottle

Still, we are here to tell you about all the benefits of owning a HydroFlask.

They come in a variety of sizes. HydroFlaks have a massive range of sizes to pick from, and you will find no trouble finding the perfect size for your needs! 

They keep warm beverages warmer for longer. 

Not only does the insulation of these drink bottles keep your water cold, but it also can keep any warm drink warm for ages. HydroFlask also has a mug that can be used for warmer drinks like coffee, tea, and soup, or you can use your normal Hydro bottle! 

They are super lightweight. Being so lightweight, which makes it easy to carry with you anywhere. 

HydroFlasks come in a wide variety of colours. So many colours to choose from. They are the perfect canvas for stickers. A HydroFlask and stickers seem to be a match. If you have any cool surfy stickers laying around a Hydroflask is a perfect place to put them. Join the VSCO girl trend.

Your water will stay cold longer than any other water bottle. 

Hydros have this excellent insulation called TempShield that will keep your water chilly almost 24 hours, with its double vacuum construction that protects the temperature of your beverage, unlike a plastic water bottle that will go warm in less than an hour. 

We strive to have stock of the best colours and sizes here at Southern Man Surf Shop, and we ship Hydro Flasks Australia Wide. You can also use Afterpay or Zippay to purchase your new Hydro flask. Avoid disappointment and buy your new Hydroflask today.