Something completely different here on mijnracket.nl today. As part of comfortable and injury-free sports, Mike was able to test a new sports insole for a few weeks. The Comfort Energy sports insoles from manufacturer Comfortable stand out particularly for shock absorption. Read on! 
The Comfort Energy sports insoles (energysoles.nl) are made of the material 'Sands'. Sands is a material that conforms to the foot and therefore provides extra support, particularly in the arch, in a natural way, comparable to walking barefoot on sand. The material has very good cushioning properties and, as the name of the insoles already suggests, also returns energy on push-off. This should be particularly noticeable on hard surfaces. I tested the insoles myself for 8 hours on gravel. Our Dutch FED Cup team member Cindy Burger has reportedly been using the Comfort Energy sports insoles for years.
Specifications:
Brand: Comfortable
Type insole: Comfort Energy Soles (energysoles.nl)
Thickness: 4.5 mm
Size: 43
Weight: 40 grams
Tested by:
Name: Mike
Playing strength: 4/4
Shoe: Mizuno Wave Exceed Tour Clay, mt. 43
Test duration: 8 hours
Current own sports insole: Footbalance 'Game'
Fit:
The fit of the Comfort Energy Soles is perfect. Size 43 is truly size 43. The insoles fit into my tennis shoes without any problems, of course after first removing my current Footbalance insoles. Fresh in the shoes, the insoles initially felt a bit thick. This took some getting used to, because the insole quickly conformed to the foot. 
Review:
Comfort and support Fresh in the shoes, the Comfort Energy Soles feel very soft and comfortable. This remained true throughout this test period. The 'Sands' material conforms to the foot, but does not permanently retain the shape of the foot. The material always returns to its original shape. On the one hand, this is nice, because it provides long-lasting, good cushioning and comfort. On the other hand, the support is less than I am used to.
Prior to this test, I had played the entire outdoor season (gravel) on my custom-made Footbalance 'Game' insoles, see this review for that. The Footbalance insoles are made in the forefoot and midfoot of a thermoplastic material that conforms to the foot after being heated. This shape and support in the arch is permanent. So this is what I am now used to. The Comfort Energy Soles provide more cushioning than my Footbalance insole, but the Footbalance insole still gives me clearly more support in my arch, something I experience as very pleasant.
Agility and foot fatigue
The Comfort Energy sports insoles are quite light at approx. 40 grams per insole. As mentioned above, I tested these insoles on gravel. My Footbalance insoles give me a nice direct response when moving sideways and pushing off. With the Comfort Energy Soles, I sank a bit more into the insole when pushing off. This came at the expense of quick turning and changing direction, which is very important in my game. So I tested the insoles on gravel. On a harder, less cushioning surface such as hard court or carpet, the insole would possibly work a bit better. Gravel naturally already cushions somewhat. I will also test the insoles on carpet in the hall this winter and will come back with my findings.
After a long session, you can tell that your feet feel less tired. The comfort level of the insoles is therefore very high.
Conclusion
The protection of the sole and the long-lasting cushioning of the Comfort Energy sports insoles are top, the support and the 'energy loss on push-off' I found a bit less. I think this insole works particularly well in sports where you move forward, such as running. Nevertheless, you get a lot of comfort for your feet for €19.99. So if that is what you are mainly looking for, I can certainly recommend the Comfort Energy Soles. As mentioned, I will also use the insoles on a harder surface, after which I will add my findings to this post.
