What is the difference between pure boost and ultra boost?

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Tags

1. #casual
2. #boost
3. #ultra
4. #designed
5. #which
6. #midsole
7. #appropriate
8. #cushioning
9. #short
10. #responsiveness
11. #support
12. #however
13. #better
14. #affects
15. #offers
16. #security
17. #capsules