Tailwind vs Skratch vs Precision Fuel & Hydration: Carbs, Sodium and When Each Wins

Tailwind Endurance Fuel wins if you want one bottle to do everything: about 25 g of carbohydrate and roughly 300 mg of sodium per scoop, so two scoops in a 500 ml flask is an hour of fuel and salt with nothing else to carry. Skratch Sport Hydration wins if you want a lighter, less sweet drink that sits under gels and aid-station food: around 20 g of carbohydrate and roughly 380 mg of sodium per serving, from cane sugar and real fruit. Precision Fuel & Hydration wins if you want carbohydrate and sodium as separate dials: PF 30 gels and chews (30 g of carbohydrate, effectively no sodium) alongside PH drink mixes and capsules rated in milligrams of sodium per litre, so a heavy or salty sweater can raise sodium without raising sugar. Only Tailwind is a tracked offer here; Skratch and Precision are named because the comparison is meaningless without them.

The numbers below are from current product labels, rounded; check the label on your own bag because formulas change. This is general sports-nutrition education, not medical advice. Practise any plan in training before racing it, and if you have a medical condition, are pregnant, or take medication that affects fluid or electrolyte balance, work with a physician or a registered sports dietitian.

What is in each: the label table

Per stated serving	Tailwind Endurance Fuel (1 scoop, about 27 g)	Skratch Sport Hydration (1 scoop, about 22 g)	Precision PF 30 Gel	Precision PH 1000 (1 sachet in 500 ml)
Calories	about 100	about 80	about 120	0 to 15
Carbohydrate	about 25 g	20 to 21 g	30 g	0 to 3 g
Carb sources	dextrose and sucrose	cane sugar and fruit	maltodextrin and fructose	minimal
Sodium	about 300 mg	about 380 mg	about 0 mg	about 500 mg (1,000 mg per litre)
Other electrolytes	potassium, calcium, magnesium	potassium, magnesium, calcium	none	potassium, magnesium, calcium
Caffeine option	yes, about 35 mg per scoop in caffeinated flavours	not in the standard mix	yes, in some flavours	no
Intended mix	1 to 2 scoops per 500 ml	1 scoop per 500 ml	eaten with water	1 sachet per 500 ml

Precision also sells a combined PF Carb & Electrolyte Drink Mix (about 30 g of carbohydrate with roughly 500 mg of sodium per 500 ml serving), a PF 90 gel (90 g of carbohydrate), and PH electrolyte capsules (about 250 mg of sodium each). Skratch sells a Super High-Carb mix (roughly 100 g of carbohydrate per serving from cluster dextrin, intended for more dilution) for runners who want the Tailwind approach with a Skratch flavour profile. Tailwind's official serving is two scoops, about 200 calories, 50 g of carbohydrate and roughly 600 mg of sodium, stated as one 24 oz bottle's worth.

Carbs per hour: building the hour with each

The common coaching guidance for events over three hours is 60 to 90 g of carbohydrate per hour, with some athletes trained to more, and most first-timers landing between 40 and 60. Assume a 60 g target and 500 ml of fluid per hour.

Tailwind, drink-only plan. Two scoops of Tailwind Endurance Fuel per 500 ml flask is 50 g of carbohydrate and about 600 mg of sodium. Add one aid-station bite (a quarter PB&J or a handful of pretzels, roughly 10 to 15 g) and you are at 60 to 65 g with nothing else in the pockets. For 90 g: two scoops in each of two flasks per hour, which is 1 L of fluid, 100 g of carbohydrate and 1,200 mg of sodium, and that is a lot of fluid and a lot of sodium for most runners. A more workable ceiling is about 2.5 scoops per hour with gels making up the rest.

Skratch, drink-plus-food plan. One scoop per 500 ml is 20 g of carbohydrate and about 380 mg of sodium. A gel (typically 22 to 30 g) plus two aid-station bites (about 20 g) gets to 60 to 70 g. For 90 g: one flask of Skratch (20 g), two gels (50 to 60 g), and food. The drink stays light and most stomachs like that; the trade is more items to manage.

Precision, modular plan. Two PF 30 gels per hour is 60 g of carbohydrate and zero sodium, taken with plain water. Sodium is added separately: PH 1000 in one flask (about 500 mg per 500 ml) or a PH capsule every hour (about 250 mg). For 90 g: one PF 90 gel per hour, or three PF 30s, with PH 1000 in the flask. It is the cleanest way to hit high carbohydrate targets with a known sodium number, and the most expensive per hour.

Sodium: think in milligrams per litre

Sodium losses in sweat vary enormously between people, roughly 200 to 2,000 mg per litre, and sweat rates run from about 0.5 to 2 litres per hour, so a single "right" number does not exist. What you can do is know the concentration of what you drink and match it in training:

• Tailwind at 2 scoops per 500 ml: about 1,200 mg per litre.
• Skratch at 1 scoop per 500 ml: about 760 mg per litre.
• Precision PH 1000: 1,000 mg per litre by design; PH 500 and PH 1500 exist for lighter and heavier sweaters.

If you finish long, hot runs with salt crust on your hat and a headache, the usual coaching advice is to move up the concentration ladder in training and see whether symptoms change; if you finish bloated with swollen fingers, move down and drink to thirst. Precision offers a sweat test for a measured number; for everyone else, a season of long runs is the test. Anyone with blood-pressure, kidney or cardiac considerations should have this conversation with a physician rather than a bag of powder.

If your plan is plain water plus gels, an electrolyte add-in such as the Andros sport hydration amplifier is one way to put the sodium layer into the water flask; read the per-serving sodium on its label and run the same milligrams-per-litre arithmetic before you rely on it.

Flavour fatigue and gut tolerance

Every drink-only plan eventually meets flavour fatigue, usually between hours six and ten. Tailwind's sweetness is moderate and its unflavoured Naked version exists for exactly this reason; the tactic that works is rotating two flavours plus Naked and keeping the second flask as plain water so the palate gets a break. Skratch's lower sugar and fruit-forward flavours fatigue slower, and its lemon-lime and pineapple lean tart rather than sweet, which is why so many runners use it as the base drink and let the aid station provide the sugar. Precision's gels are deliberately neutral (the original flavour is close to plain) and its drink mixes are lightly flavoured.

Gut tolerance follows concentration. A 500 ml flask carrying 50 g of carbohydrate (Tailwind at two scoops) is roughly a 10 percent solution, near the top of what most people absorb well while running; at one scoop it is 5 percent and easy. Skratch at 4 percent is the gentlest. Precision's gels are designed to be taken with water, and the 90 g gel in particular needs several hundred millilitres alongside it. If your stomach shuts down in races, the usual fix is lower concentration and more frequent, smaller intake, then training the gut upward over months.

When each wins

• Hot, sweaty races where you want to carry less: Tailwind. Two scoops per flask covers fuel and salt, you refill from the aid-station jug and go. A 30-serving bag is the right size for a 100-mile season and for pre-portioning into drop bags.
• Long, cold or food-heavy races, such as mountain 100s with hot aid-station food: Skratch as the drink, real food as the fuel. The drink stays light, the sodium is respectable, and you are not fighting a sweet bottle at 4 a.m.
• Structured 80 to 100 g per hour plans, salty sweaters, and anyone who wants to change one variable at a time: Precision. Gels carry the carbohydrate, PH mixes carry the sodium, and both are labelled in plain numbers.
• First 50K with an uncertain stomach: Skratch or Tailwind at one scoop, with gels you have practised, and a written hourly plan.

Aid-station logistics

Powder is the weak point of any drink-mix plan. Three ways to handle it:

1. Pre-portioned baggies in the vest and drop bags, one per flask fill: two scoops of Tailwind or one of Skratch per snack-size bag, labelled with a marker.
2. Single-serve sticks, which all three brands sell, for the front pocket. They cost more per serving and never spill.
3. The course's own drink as fallback. Many North American ultras stock Tailwind at aid stations, and knowing the on-course drink lets you plan around it: if the course has Tailwind, you carry PF gels or Skratch only for the segments you want to control.

Rinse flasks at each refill if you are switching between mix and water; a residue of drink mix in the "water" flask is how the plain-water palate break disappears.

Cost per hour, roughly

Prices move; treat these as ballpark from current retail. A 30-serving Tailwind bag at roughly $40 works out near $1.30 per two-scoop serving, or about $1.50 to $2.00 per hour at 60 g. Skratch's 20-serving bag at roughly $22 lands about $1.10 per scoop, plus gels, for perhaps $2.00 to $2.50 per hour. Precision PF 30 gels run about $2.50 to $3.00 each and PH 1000 sachets about $1.00 to $1.30, so a 60 g hour costs roughly $6 to $7. Precision's per-hour price is the tax on modularity and a very clean label; whether it is worth it depends on how much control you need.

Practise it, then race it

Whichever system you pick, the only test that counts is a long run at race intensity in race weather with the exact products, concentrations and timing you plan to use, repeated until it is boring. Start at the low end of the carbohydrate range and add about 10 g per hour every few weeks; write the plan on a strip of tape on a flask; and keep notes on what your stomach did after hour three. That practice, not the brand, is what shows up in the second half of the race.