Two Speedo fabrics, one back cut
Speedo’s ProLT super pro back runs about $40 on 82% polyester with 18% spandex. Speedo’s Endurance+ super pro back runs about $54 on a polyester-PBT blend. The back construction matches across both. The fiber makeup underneath differs.
Arena’s MaxLife sits at the top
Arena’s MaxLife pro back runs about $58 on 100% polyester. A single-fiber polyester build carries no spandex content, so its stretch comes from the knit structure.
Why the spandex share matters here
Spandex breaks down faster than polyester or PBT under repeat chlorine exposure. A blend leaning on spandex for stretch loses shape sooner than one built on PBT. The percentage is stated on most product pages, which makes it quick to compare.
What to look out for
Spandex or elastane above roughly 20% of the blend · a pro back claim with no fabric line named · a stated fiber split that skips the PBT share · strap width narrower than the product photo suggests.
Compare
| Suit | At a glance | Sizes | Price | |
|---|---|---|---|---|
 Arena Arena Girls Team Swim Pro Back Solid Swimsuit - Blue Cosmo/Water | Chlorine-resistantpro back | 24,26,28,30 | $25 £18.48 | Allens Swimwear→ |
 Arena Arena Womens Team Swim Pro Back Solid Swimsuit - Very Fuchsia/Team Green | Chlorine-resistantpro back | 28,30,32,34,36,38 | $39 $34 £25.13 15% off | Allens Swimwear→ |
 Arena Arena Womens Team Swim Pro Back Solid Swimsuit - Blue Cosmo/Artic Lime | Chlorine-resistantpro back | 28,30,32,34,36,38 | $39 £29.57 | Allens Swimwear→ |
 Arena Arena Womens Team Swim Pro Back Solid Swimsuit - Future Dusk/Black | Chlorine-resistantpro back | 28,30,32,34,36,38 | $39 £29.57 | Allens Swimwear→ |
 Arena Arena Womens Team Swim Pro Back Solid Swimsuit - Water/Asphalt | Chlorine-resistantpro back | 28,30,32,34,36,38 | $39 £29.57 | Allens Swimwear→ |
SP Speedo Speedo Women’s ProLT Super Proback Solid One Piece | Chlorine-resistantprobackpro backsuper pro backone piece | 24,26,28,30,32,34,36,38,40 | $40 | Amazon→ |
 Amanzi Amanzi Girls Baltix Proback One Piece Swimsuit - Blue/Purple | Chlorine-resistantprobackone piece | 24,26,28,30,32,34,36,38,40 | $46 £34.20 | Allens Swimwear→ |
 Amanzi Amanzi Girls Desert Blush Proback One Piece - Green/Pink | Chlorine-resistantprobackone piece | 26,28,30,32,34,36 | $46 £34.20 | Allens Swimwear→ |
 Amanzi Amanzi Girls Pastella Proback One Piece Swimsuit - Orange/Blue | Chlorine-resistantprobackone piece | 24,26,28,30,32,34,36,38 | $46 £34.20 | Allens Swimwear→ |
 Amanzi Amanzi Girls Splendour Proback One Piece Swimsuit - Purple/Blue | Chlorine-resistantprobackone piece | 24,26,28,30,32,34,36,38 | $46 £34.20 | Allens Swimwear→ |
 Amanzi Amanzi Womens Baltix Proback One Piece Swimsuit - Blue/Purple | Chlorine-resistantprobackone piece | 24,26,28,30,32,34,36,38,40 | $46 £34.20 | Allens Swimwear→ |
 Amanzi Amanzi Womens Pastella Proback One Piece Swimsuit - Orange/Blue | Chlorine-resistantprobackopen backone piece | 24,26,28,30,32,34,36,38 | $46 £34.20 | Allens Swimwear→ |
 Amanzi Amanzi Womens Splendour Proback One Piece Swimsuit - Purple/Blue | Chlorine-resistantprobackone piece | 24,26,28,30,32,34,36,38 | $46 £34.20 | Allens Swimwear→ |
 Amanzi Amanzi Girls Kalei Proback One Piece Swimsuit - Pink/Multi | Chlorine-resistantprobackone piece | 24,26,28,30,32,34,36,38 | $49 £37.05 | Allens Swimwear→ |
 Amanzi Amanzi Girls Kiki Proback One Piece Swimsuit - Blue/Purple | Chlorine-resistantprobackone piece | 24,26,28,30,32,34,36,38 | $49 £37.05 | Allens Swimwear→ |
 Amanzi Amanzi Girls Maribella Proback One Piece Swimsuit - Pink/Multi | Chlorine-resistantprobackone piece | 24,26,28,30,32,34,36,38 | $49 £37.05 | Allens Swimwear→ |
 Amanzi Amanzi Girls Sirena Proback One Piece Swimsuit - Blue/Multi | Chlorine-resistantprobackone piece | 24,26,28,30,32,34,36,38 | $49 £37.05 | Allens Swimwear→ |
 Amanzi Amanzi Girls Solmare Proback One Piece Swimsuit - Multi | Chlorine-resistantprobackone piece | 24,26,28,30,32,34,36,38 | $49 £37.05 | Allens Swimwear→ |
 Amanzi Amanzi Womens Kalei Proback One Piece Swimsuit - Pink/Multi | Chlorine-resistantprobackone piece | 24,26,28,30,32,34,36,38 | $49 £37.05 | Allens Swimwear→ |
 Amanzi Amanzi Womens Kiki Proback One Piece Swimsuit - Blue/Purple | Chlorine-resistantprobackone piece | 24,26,28,30,32,34,36,38 | $49 £37.05 | Allens Swimwear→ |
 Amanzi Amanzi Womens Maribella Proback One Piece Swimsuit - Pink/Multi | Chlorine-resistantprobackone piece | 24,26,28,30,32,34,36,38 | $49 £37.05 | Allens Swimwear→ |
 Amanzi Amanzi Womens Sirena Proback One Piece Swimsuit - Blue/Multi | Chlorine-resistantprobackone piece | 24,26,28,30,32,34,36,38 | $49 £37.05 | Allens Swimwear→ |
 Amanzi Amanzi Womens Solmare Proback One Piece Swimsuit - Multi | Chlorine-resistantprobackone piece | 24,26,28,30,32,34,36,38 | $49 £37.05 | Allens Swimwear→ |
SP Speedo Speedo Endurance+ Super Proback Solid One Piece | Chlorine-resistantprobackpro backsuper pro backone piece | 28,30,32,34,36,38 | $54 | Amazon→ |
AR Arena Arena MaxLife Pro Back One Piece | Chlorine-resistantpro backone piece | 26,28,30,32,34,36 | $58 | Amazon→ |
Prices and exchange rate as of Oct 27, 2026 (£1 = $1.3347). Allens prices are charged in pounds; the dollar figure is a conversion. Check the retailer for the current price.
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FAQ
How long does a spandex-blend suit hold up next to a 100% polyester one?
It depends on how often it meets chlorine. At three or more sessions a week the difference in shape retention shows up within a few months. At lower frequency it takes much longer to notice.
Does pro back sizing match racerback sizing in the same brand?
Generally yes within one brand, since both run off the same chart. The fit across the shoulders still differs because the strap and panel widths aren’t the same.