Product Description
Most athletes know they should drink more in the heat. What they miss is that the formula working on a cool morning ride isn't right when temperatures spike, and sweat rate doubles. Your hydration strategy isn't wrong; it's just not matched to the conditions you're actually training in.
The Hydration Heat Check puts the best summer drink mixes side by side, from no-sugar everyday hydration to high-sodium formulas built for when the heat turns up.
From Everyday to Salty — Same Brand, Different Job Mortal Hydration appears twice in this pack intentionally. Their no-sugar Everyday formula is for daily use and lower-intensity training; their high-sodium Salty formula is built for heavy sweaters and hot conditions. Testing both tells you exactly which end of the sodium spectrum your body actually needs.
Fuel + Hydration vs. Hydration Alone Tailwind's Endurance Fuel blends carbohydrates alongside electrolytes, one drink that fuels and hydrates for long efforts. Skratch, Mortal, and Hyperlyte are pure hydration plays. Testing both approaches teaches you whether your body performs better drinking its calories or keeping fuel and fluids separate.
The Invisible Upgrade Hyperlyte H1 Neutral is a flavorless liquid concentrate you can add to any drink, gel, or food without changing the taste. It's the silent electrolyte booster for athletes who have a routine they like but want sharper coverage when the heat rises.
Electrolytes, the minerals that keep your muscles firing and help your cells absorb fluid, are non-negotiable for summer training. Sodium is the most critical one, and sweat rates vary so dramatically between athletes that the right dose for you is likely different than your training partner's. The products in this pack range from moderate everyday sodium to high-sodium formulas built for athletes who still end up cramping despite drinking plenty.
Hot Conditions: Reach for Mortal Salty or Tailwind for any effort in high heat or humidity, where sodium loss runs high.
Everyday Training: Use Mortal Everyday or Skratch Labs for regular sessions where matching sweat loss is the goal without overshooting sodium.
Pro Tip: Add Hyperlyte H1 Neutral to whichever drink you're already mixing for a flavorless electrolyte boost — the easiest upgrade in this pack.
Tailwind has a cult following among ultrarunners and long-course triathletes who need stomach-friendly all-in-one fueling for big days. Skratch was built by a sports dietitian who fueled Tour de France teams and has been a professional cycling staple ever since.
Your hydration strategy should match the conditions you're actually training in. This is the pack that helps you figure out exactly what that looks like.
Flavors may vary.
Always Happy Promise: Don't like a product? Tell us within 30 days of receipt and we'll make it right and make you happy. Here at The Feed, we want you to love your experience and the sports nutrition products you purchase. If, for any reason, you are not satisfied with your nutrition specific purchase, tell us.
We do not accept returns on food items that have been opened, but we will issue a store credit if you are unsatisfied. In the event of a return, you must first contact us before sending back a return shipment.
Consumable products over $40 receive a 50% store credit. This includes specialty nutrition products such as ketones or supplements/vitamins.
Hydration Heat Check FAQ's
Everything you need to know about Hydration Heat Check.
The pack covers three distinct hydration approaches. Mortal Hydration, Skratch Labs, and Hyperlyte are pure electrolyte drink mixes — no carbs, focused entirely on fluid and mineral replacement. Tailwind Endurance Fuel adds carbohydrates alongside electrolytes, functioning as both a hydration drink and an energy source. Hyperlyte H1 Neutral is a flavorless liquid concentrate you can add to any other drink or food to boost electrolytes without changing the flavor.
Mortal's "Salty" line contains significantly more sodium than their standard formula. It's designed specifically for heavy sweaters, hot-weather training, and athletes who experience cramping despite staying hydrated. Their Everyday Aloha formula is a lower-sodium, no-sugar option intended for regular daily hydration and lower-intensity sessions. If you're not sure which you are, this pack is designed to help you find out.
Tailwind Endurance Fuel is an all-in-one endurance fuel, not just a hydration mix. Each serving delivers carbohydrates alongside a full electrolyte profile — designed to be your primary fuel source during long efforts without needing to carry separate gels or chews. It's particularly popular with ultrarunners and long-course triathletes who want to keep their nutrition as simple as possible for events lasting several hours or more.
Hyperlyte H1 is a liquid electrolyte concentrate, and the Neutral flavor has zero taste — meaning you can add it to any drink, gel, water bottle, or even food without affecting the flavor at all. Use it to boost the electrolyte content of whatever you're already drinking, or on days where plain water isn't cutting it but you don't want a flavored drink mix. It's the most versatile product in this pack.
A few common signs: you cramp regularly despite drinking enough, you see white residue (salt) on your skin or kit after training, you feel significantly worse in hot or humid conditions compared to other athletes, or you find yourself craving salty foods immediately after exercise. If any of those sound familiar, the Mortal Salty formula and the higher-sodium products in this pack are worth prioritizing in your test sessions.