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Siro Sleep Bralette


We designed a bra to sleep in—yeah, it’s that comfortable. Make it a set with the Siro Bikini or better yet, a trifecta with the Siro Sleep Brief. All meant to be layered under any of our sleepwear.

  • Flattering coverage
  • Racerback design
  • Ultra-fine Japanese elastic straps and band
  • Good for wild sleepers, hot sleepers, and for layering
  • Machine wash, cold + lay flat to dry
  • Siro Modal—94% tencel, 6% spandex



Meant for women with A to C cups. For those of you more endowed, try our Siro Well-Rounded Bralette.


Christy is featured wearing the White/White, Black/White, and Eclipse/Black colorways in size small. She is 5’9” with a 34” bust, a 26” waist, and 36.5” hips.

Jessica is featured wearing the Black colorway in size extra small. She is 5' 7 with a 32" bust, a 25" waist, and 36" hips. 



(fit to rib cage, not cup size)

XS — >32"

S — 33"

M — 34"

L — 36"

Unsure of your size? No need to lose sleep over it - we are here to help! To ensure proper fit, please refer to the fit guide below and if you have any questions, please feel free to email us at We are happy to guide you!

Size XS S M L XL
Numerical 0 2-4 6-8 10-12 14
Bust 32-33 34-35 36-37 38-39 40-41
Waist 26 27-28 29-30 31-32 33-34
Hip 36 37-38 39-40 41-42 43-44
Inseam 29.5 30 30.5 31 31

Measurements are in inches and refer to body size, not garment dimensions. Please note that fits may vary by style and personal preference.

Need help with your size? Have a suggestion or feedback?

Lunya gladly accepts exchanges and free returns of unworn/unwashed items with the original tags attached within 30 days of your order ship date. Underwear, Gift Cards, & Sale Items are nonrefundable. Please visit our automated ONLINE RETURN PORTAL or email our customer happiness team at to initiate an exchange/return or with any further questions. THX!