Heavy salty sweaters often struggle in hot events unless they aggressively replace sodium; low salty sweaters over-supplement and get GI issues. Simple check: if your kit is covered in visible white streaks after a hard ride, you are likely in the high-sodium category. Lab tests (Precision Hydration, Levelen) quantify the rate. Typical replacement targets: 300mg/L for low sweaters, 700mg/L for moderate, 1000mg+/L for heavy. Sodium is particularly important over 3+ hour rides in heat.
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