• The Alex Mill x Margaux: The Selene Flat Sandal in Poppy Satin features wide crisscross straps, an open toe, and a flat slip-on design in red—shown side profile on white—perfect for summer by Margaux.
  • A person in a red sweater, white pants, and Margaux's Alex Mill x Margaux: The Selene Flat Sandal in Poppy Satin sits on the ground with knees up, holding one ankle. The background features a light wall and textured pavement.
  • The Alex Mill x Margaux: The Selene Flat Sandal - Poppy Satin features red satin crisscross straps, square toes, and black insoles with gold text, shown on an off-white background—an effortless summer style by Margaux.
  • A pair of red Alex Mill x Margaux Selene Flat Sandals in poppy satin with crisscross straps and square toes, featuring Margaux branding on the footbeds—perfect summer sandals, displayed on a white background.
  • The Alex Mill x Margaux: The Selene Flat Sandal in poppy satin features crisscross straps and flat black soles, shown from top and bottom on a plain light background—ideal summer sandals for casual occasions. Brand: Margaux.
  • The Alex Mill x Margaux: The Selene Flat Sandal in Poppy Satin by Margaux is a red, open-toe, slip-on sandal with wide crisscross straps and a slight heel, shown on a plain white background.
  • A close-up top view of the Alex Mill x Margaux: The Selene Flat Sandal in poppy satin, a red slip-on with wide crisscross straps, square toe, and dark insole with gold text—perfect summer style from Margaux.

The Selene Flat Sandal

 
 
 
 

A slip-on sandal with an attitude that works dressed up or down, perfect for summer in three special hues curated with the team at Alex Mill.

Color: Poppy Satin
Core
Alex Mill x Margaux
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Size: | Select A SizeBetween sizes? We recommend taking your smaller size. See Size Guide below for additional width-specific guidance.
Length
Select Width
Width | Medium
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  • Supersoft folded straps
  • Subtly square toe adds a modern touch
  • Satin upper with smooth leather lining
  • 5 mm of plush foam padding
  • Handmade in Spain

Narrow & Medium Widths: If you are between sizes, we recommend taking your smaller size.

Wide Width: We recommend ordering your usual size. While this style runs slightly long, sizing down may cause the fit to feel too narrow through the straps.

  • Medium: A standard width throughout (comparable to a B width)
  • Narrow: A slimmer fit throughout (comparable to an A width)
  • Wide: A roomier fit at the ball of the foot (comparable to a BC-BD width

US 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 8.5-9 9 9.5 9.5-10 10 10.5 11 11.5 12 12.5 13 13.5 14
EUR 33 33.5 34 34.5 35 35.5 36 36.5 37 37.5 38 38.5 39 39.5 40 40.5 41 41.5 42 42.5 43 43.5 44 44.5 45

Still unsure? Contact Us

Our satin shoes are crafted with luxurious fabric that offers an elegant sheen but requires thoughtful care. Satin is a delicate material and is prone to staining and water damage, so we recommend avoiding exposure to rain, moisture, and rough surfaces.

To clean, gently blot marks with a soft, dry cloth. For tougher stains, a small amount of lukewarm water and mild soap can be used sparingly—but always test on a hidden area first. Do not rub, as this can damage the weave and finish.

We recommend storing your satin shoes in a dust bag and away from direct sunlight to preserve their color and luster over time.

Shipping:

For US orders, standard shipping is complimentary on orders over $100; a $4.95 shipping fee applies to orders under $100. Expedited FedEx 3Day, 2Day, and Overnight options are available at checkout.

For international orders, shipping rates are calculated at checkout. All international shipments are sent Delivered Duty Paid (DDP), meaning duties and taxes are collected at checkout for smooth delivery.

In-stock orders ship within 1–2 business days. Expedited orders placed after 2pm ET will ship the following business day.

For preorders, payment is collected at checkout. Please refer to the “Expected to ship” date on the product page for estimated availability.

For more details, check out our Shipping FAQs.

Returns & Exchanges:

For U.S. and Canadian orders, we accept returns on new, unworn items within 14 days of delivery, and exchanges or returns for store credit within 30 days.

Returned items must be free of wear, scuffing, creasing, debris, or damage and include all original packaging. All returns are inspected upon arrival and must meet these condition requirements to qualify for a refund.

Return shipping is complimentary for exchanges and store credit within the U.S.
Refunds on U.S. orders incur an $11 return shipping fee, unless Return Protection was added at checkout for $3.98.

For international orders (outside the U.S. and Canada), all purchases are final sale and not eligible for return or exchange.

Final Sale items are not eligible for return or exchange.

For more details, check out our Returns & Exchanges FAQs.

Alex Mill x Margaux: The Selene Flat Sandal - Poppy Satin

 
 
Select A Size
×

Size Guide

Narrow & Medium Widths: If you are between sizes, we recommend taking your smaller size.

Wide Width: We recommend ordering your usual size. While this style runs slightly long, sizing down may cause the fit to feel too narrow through the straps.

US 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 8.5-9 9 9.5 9.5-10 10 10.5 11 11.5 12 12.5 13 13.5 14
EUR 33.5 34 34.5 35 35.5 36 36.5 37 37.5 38 38.5 39 39.5 40 40.5 41 41.5 42 42.5 43 43.5 44 44.5 45
What are our widths?
  • Medium A standard width throughout (comparable to a B width)
  • Narrow A slimmer fit throughout (comparable to an A width)
  • Wide A roomier fit at the ball of the foot (comparable to a BC-BD width)
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Slip-on-and-go style, PERFECTED

Warm-weather style boils down to a feeling of effortlessness that's best perfected with an easy slide designed to be worn everywhere. We used ultra-luxe leather for soft straps that sit perfectly across the foot, while our signature foam padding provides a soft cushion at the insole. A subtly squared-off toe offers up a quiet touch of modernity, turning this slide into your new sunshine favorite.