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As I understand it. Theres quite a decent difference between speedsuits too.
I was thinking about the same suit. One short sleeved (with silicon grippers etc) With arm warmers under. One long sleeved. I may be underestimating the difference to justify my choice I Guess. I run my elbow pads miles apart, so my arms are definitly out in the Wind. Long sleeved stuff is always shit on me though.
There's 15w between a close fitting LS club skinsuit and a top end one. More if you go full custom.