Product Description
Curious about SiS?
Pro cycling's nutrition lab has been feeding World Tour athletes for years. SiS is the brand behind some of the most scientifically formulated fueling products in endurance sport — developed alongside performance researchers, tested in some of the hardest races on the calendar, and now accessible to any athlete who trains seriously.
This pack runs the full SiS product range in one order — gels, chews, a high-carb drink mix, electrolyte tablets, and recovery — so you can test their complete system across a single training block.
From Everyday to Elite, One Brand
The GO Isotonic Gels are the everyday workhorse — no water needed, 22g of carbs, reliable at any intensity. The Beta Fuel system is where the science gets serious: an 80g carbohydrate per serving drink mix and 40g gel using a glucose to fructose ratio that pushes your hourly absorption ceiling significantly beyond what standard gels can achieve.
Every Format Your Training Requires
Gels, chews, drink mix, electrolyte tablets, and a recovery drink in one pack. Testing different delivery formats across training sessions tells you which combination works for your stomach at race pace — before you commit to a full race supply of anything.
The Nootropic Upgrade
The Beta Fuel Nootropic Gel adds theanine and caffeine alongside the 40g carbohydrate payload, targeting mental sharpness in the back half of a long effort when focus fades as fast as legs do.
Your gut uses two separate pathways to absorb sugar — one for glucose, one for fructose. Standard gels run glucose only, capping absorption at around 60g per hour. Beta Fuel's 1:0.8 glucose to fructose ratio loads both pathways simultaneously, pushing that ceiling toward 90g. For long, hard efforts, that gap is the difference between running on full or scraping the bottom.
Training Days: Reach for the GO Isotonic Gels and Hydro Tablets — clean, no fuss fueling for sessions under 90 minutes.
Race Simulation: Run the Beta Fuel Drink Mix and Nootropic Gel together for long efforts where you're targeting 80 to 90g of carbs per hour.
Recovery: Mix the REGO Clear Recovery within 30 minutes of finishing any hard session to start the rebuild before the soreness sets in.
SiS has supplied WorldTour cycling teams and Olympic athletes across multiple sports. The Beta Fuel formula was developed in direct partnership with sports scientists researching the upper limits of carbohydrate absorption — which is why it performs differently from everything else in the category.
Stop wondering if SiS is worth the switch. This pack is your one-week answer.
What You Get:
- 1 x SiS GO Isotonic Gels
- 1 x SiS GO Energy Caffeine Gel
- 1 x SiS GO Energy + Electrolyte Gel
- 1 x SiS Beta Fuel Nootropic Gel
- 1 x SiS Beta Fuel Chew
- 1 x SiS REGO Clear Recovery
- 1 x SiS HYDRO+
- 2 x SiS Beta Fuel Drink Mix
- 2 x SiS Hydro Tablets
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.
SiS Tryout Pack FAQ's
Everything you need to know about SiS Tryout Pack.
GO Isotonic Gels are SiS's everyday formula — 22g of carbohydrates, no water required, clean and reliable for training sessions and shorter efforts. Beta Fuel is their premium performance system designed for high-output efforts where you need 80g of carbohydrates per hour or more, using a glucose to fructose ratio that allows your gut to absorb significantly more fuel than standard gels can deliver.
The Beta Fuel Nootropic Gel delivers 40g of carbohydrates alongside theanine and caffeine, targeting both physical fuel and mental focus in the same serving. It's best used mid-effort during long, hard sessions or races when both legs and concentration start to fade — typically from the 90-minute mark onward.
Use the Hydro Tablets and HYDRO+ for pre-session and in-session hydration. Reach for GO Isotonic Gels early in shorter efforts, and switch to the Beta Fuel Drink Mix and Nootropic Gel for longer, harder work where higher carbohydrate intake matters. Within 30 minutes of finishing, mix the REGO Clear Recovery to start the rebuild process.
Both. Athletes new to SiS get to test the full range before committing to any single product in bulk. Experienced athletes who've only used one or two SiS products — typically the GO gels — often find the Beta Fuel system is a meaningful upgrade for race-length efforts and use this pack to make the switch properly.
Yes — every product in this pack is available individually on TheFeed.com. The pack is specifically designed as a low-commitment way to find what works before buying in volume, so reordering your favorites once you've tested them is the intended next step.