Why are rash guards called rash guard?

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Tags

1. #caused
2. #shirts
3. #these
4. #surface
5. #extended
6. #themselves
7. #rapid
8. #impact
9. #water
10. #abrasion
11. #shirt
12. #rashes
13. #wearer
14. #against
15. #helps
16. #waves
17. #sunburn
18. #exposure
19. #prevent
20. #guard
21. #wetsuit
22. #reflects
23. #protects
24. #irritation
25. #under