Disclaimer: I received SiS isotonic gels to review as part of being a BibRave Pro. Learn more about becoming a BibRave Pro (ambassador), and check out BibRave.com to review, find, and write race reviews!
I was pretty keen to try SiS gels as I know they are quite popular with my running friends in the UK. I received a very generous supply of SiS gels to test — Double Espresso, Apple, Salted Strawberry, and Lemon & Mint.
First The Science
So what’s all this Isotonic malarkey?! If you’ve taken gels before, you’ll probably know that you’re supposed to consume them with water. Isotonic gels are designed to be consumed without water, minimizing the risk of being bloated that can sometimes occur with over-drinking.
The isotonic formula allows the gel to empty from the stomach quickly as no fluid needs to be drawn into your stomach to dilute the gel, providing fast energy.
The SiS gel consistency is more watery than most other gels, which makes them real easy to consume on the run. The gel packs are also larger than regular gels, so you’ll need a little extra room to carry multiple gels packs on a longer run.
I had no problems carrying my normal supply (1 gel pack for every 5 miles) in my Flipbelt and Amphipod vest.
Now The Flavors
The “Double Espresso” gel has a 150mg boost of caffeine. When I group tested this pack, some of the crew did seem to benefit from the espresso jolt, sprinting to the finish of our long run.
I didn’t think I’d like the strong coffee flavor, actually I thought I’d hate it, but I didn’t! It was surprisingly palatable. However, due to the stronger flavor this gel is more suited pre-run (or post) as the caffeine effects can take up to one hour to kick in.
The yummy Apple flavor was my go-to for most runs, and the only isotonic flavor I was given to test. It had a subtle apple taste and was real easy to consume. This was also a group favorite as well.
Salted Strawberry and Lemon & Mint gels are packed full of extra electrolytes, but since these flavors are not isotonic, it’s recommended you consume some water along with them. If I’m on a long run that requires gels, I’m normally carrying water anyway.
When I shared out some gels with my running group, a couple of them commented on how the Salted Strawberry tasted like Guava Juice. I’ve never had Guava Juice, so I can’t compare!
I do have to say, I love these flavor combinations, they’re so fancy, and they definitely bring something a little different to the usual gel offerings.
As I mentioned above, the consistency of all these flavors is similar. They are not watery to the point they can be poured from the packet, which is great, as that may have caused issues for runners trying to consume them on the run!
Again, science, people.
Give It Away, Give It Away, Give It Away Now
Yes, it’s true, Science In Sport want to give away a pack of 6 gels each to 2 of my lovely social media followers. Go to the following post on Instagram, follow me, @alastairvance (if you haven’t already) and follow @scienceinsport. Then in the Instagram comments, tag two of your running buddies who could do with an energy boost. Easy peasey lemon squeezy.
Everyone’s A Winner, Baby, That’s The Truth
Didn’t win the drawing? Well, everyone is a winner here. Using code TRYSIS25 you can save 25% off your order on scienceinsport.com.
Check out other BibRave reviews of Science In Sport Isotonic Gels: