There are a ton of really effective products that can help prevent boob sweat rashes.
MegaBabe’s Bust Dust is really wonderful - it’s a talc-free powder that absorbs sweat instantly, helping to keep your bra and top dry. Lume and Native have also recently come out with whole body deodorants, which are essentially deodorants that can be used anywhere — not just your pits. These products are designed to dry up sweat, prevent new sweat from forming, and leave a nice scent.
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CrossOver Bra Wireless Bra
Honeylove's criss-cross mesh adds a signature touch, and a bonded underbust lifts without underwire. A wide wing with back-smoothing fabric eliminates back bulges. Adjustable straps and back let you modify your fit, and the straps can also be crisscrossed to stay hidden under racerback tank tops.
3D printed velvet adds support, and a bonded underbust lifts without underwire. Adjustable straps and back closure let you modify your fit. Straps can also be crisscrossed to stay hidden under racerback tank tops.