Pros
- Easy to open
- Watery texture
- Pleasant orange taste
- No stomach issues
Cons
- No energy boost
- Very weak impact
- Not for long runs
- First Impressions & Use Case
This has been my go-to gel for over five years — the one I’ve always defaulted to without really questioning it.
It’s dependable, widely available, and has a long shelf life, which makes it an easy choice when you just want something that works without thinking too much about it.
- Performance on the Trail
SIS gels are reliable, but they’re not without their drawbacks. The packet is relatively bulky and heavier than some alternatives, and it takes a bit of effort to get the gel down. The texture is slightly grainy and can feel a bit like congealed jelly — not the most appealing mid-run.
That said, it’s consistently gentle on the stomach, which is probably why I’ve stuck with it for so long. Energy release is steady rather than dramatic, and I’ve never had any real issues using it.
I do find there’s a limit, though — after around four gels in a race, it starts to feel like enough, and I’d usually switch to other nutrition to avoid any digestive pushback.
- What Works Well
SIS is the definition of dependable. It does the job, and it does it consistently.
It’s a solid option for shorter efforts — up to marathon distance — where reliability matters more than efficiency. Being isotonic, it’s easy to take without water, which is a real advantage, especially for newer runners or those who prefer to keep things simple.
- What Could Be Better
This is where SIS is starting to show its age.
The packaging can be awkward — the opening tab doesn’t always tear cleanly and sometimes needs pulling from both sides, which isn’t ideal when you’re on the move.
Once used, the packet tends to be sticky and can leak in a belt or pocket, leaving a mess behind. It’s also easy to end up with sticky hands if you’re not careful.
The bigger issue, though, is efficiency. Compared to newer gels, it’s bulkier and less energy-dense, meaning you’re carrying more for less return. Over longer distances, that starts to matter.
Flavour fatigue is another factor — taking multiple gels of the same type quickly becomes unappealing, so variety is almost essential.