The Brooks Glycerin Flex and On LightSpray Cloudmonster 3 Hyper are both neutral road running shoes with maximum cushioning. The Glycerin Flex costs about $110 less (from $170). The LightSpray Cloudmonster 3 Hyper is 0.8 oz lighter (7.2 oz vs 8 oz).
Bottom line: Pick the Glycerin Flex if you want to spend less; pick the LightSpray Cloudmonster 3 Hyper if you want the lighter shoe.
Specs side by side
| Spec | Glycerin Flex | LightSpray Cloudmonster 3 Hyper |
|---|---|---|
| Price | $170 | $280 |
| Rating | 4.4 / 5 (542 reviews) | — |
| Weight | 8 oz | 7.2 oz |
| Heel-to-toe drop | 6 mm | 6 mm |
| Cushioning | Max Cushioning | Max Cushioning |
| Support | Neutral | Neutral |
| Surface | Road | Road |
| Available for | Men & Women | Men & Women |
Specs and prices from Brooks and On, checked 2026-11-02. Weight is usually for a men's size 9–10.
Which should you get?
Get the Glycerin Flex if…
- you want to spend less
Get the LightSpray Cloudmonster 3 Hyper if…
- you want the lighter shoe
More comparisons
- Brooks Glycerin Flex vs Adidas Hyperboost Edge Hermanos Koumori
- Brooks Glycerin Flex vs On Cloudboom Volt PAF
- Brooks Glycerin Flex vs ASICS HYPER SPEED 6
- Brooks Glycerin Flex vs ASICS GLIDERIDE MAX 2
- Brooks Glycerin Flex vs Adidas Hyperboost ATR W
- On LightSpray Cloudmonster 3 Hyper vs ASICS BLOOMSTRIDE
- On LightSpray Cloudmonster 3 Hyper vs Adidas Hyperboost Edge Hermanos Koumori
- On LightSpray Cloudmonster 3 Hyper vs ASICS HYPER SPEED 6