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Original Ray-Ban RB3637 New Round Replacement Lenses

Price range: $17.99 through $35.99

Size chart

Clothing Size Conversion Chart
Category	US	EU	UK	Chest (in)	Waist (in)	Hips (in)
Men	XS	44	34	32-34	26-28	33-35
	S	46	36	34-36	28-30	35-37
	M	48	38	38-40	32-34	39-41
	L	50	40	42-44	36-38	43-45
	XL	52	42	46-48	40-42	47-49
Women	XS	32	6	31-32	24-25	33-34
	S	34	8	33-34	26-27	35-36
	M	36	10	35-36	28-29	37-38
	L	38-40	12-14	37-39	30-32	39-41
	XL	42	16	40-42	33-35	42-44
Youth	XS	128	7	26-28	23-24	26-28
	S	134	8	28-30	24-25	28-30
	M	140	10	30-32	25-26	30-32
	L	146	12	32-34	26-27	32-34
	XL	152	14	34-36	27-28	34-36

Pants Size Conversion Chart
Category	US	EU	UK	Waist (in)	Hip (in)	Inseam (in)
Men	28	44	28	28	34	30
	30	46	30	30	36	31
	32	48	32	32	38	32
	34	50	34	34	40	33
	36	52	36	36	42	34
Women	0	32	4	24	34	30
	2	34	6	25	35	30
	4	36	8	26	36	31
	6	38	10	27	38	32
	8	40	12	28	40	32

Shoes Size Conversion Chart
Category	US	EU	UK	Foot Length (in)
Men	6	39	5.5	9.25
	7	40	6.5	9.625
	8	41	7.5	10
	9	42	8.5	10.25
	10	43	9.5	10.625
	11	44	10.5	11
	12	45	11.5	11.25
	13	46	12.5	11.625
Women	5	35	2.5	8.5
	6	36	3.5	8.875
	7	37	4.5	9.25
	8	38	5.5	9.625
	9	39	6.5	10
	10	40	7.5	10.25
	11	41	8.5	10.625
	12	42	9.5	11
M (Unisex)	5	37	4.5	8.75
	6	38	5.5	9
	7	39	6.5	9.5
	8	40	7.5	10
	9	41	8.5	10.25
	10	42	9.5	10.625
	11	43	10.5	11
	12	44	11.5	11.25

color

31 - GREEN - CRYSTAL

33 - BROWN UNIFORM - CRYSTAL

3F - BLUE GRADIENT - CRYSTAL

51 - BROWN LIGHT GRADIENT- CRYSTAL

G1 - GREEN MIRROR BLUE - CRYSTAL

G3 - POLAR CLEAR GRADIENT DARK GREY - CRYSTAL

G4 - POLAR CLEAR GRADIENT DARK GREEN - CRYSTAL

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Description
Additional information

Description

Original Ray-Ban RB3637 replacement lenses

Bring your Ray-Ban RB3637 sunglasses back to life without buying a new frame. These original Ray-Ban replacement lenses restore the look and optical performance of your sunglasses while helping you save up to 60% compared with purchasing a complete new pair. Free shipping is included.

Model compatibility

These lenses are made for the Ray-Ban RB3637 model. They should not be treated as universal round Ray-Ban lenses, because the fit depends on the exact frame code, Phantos shape, Base 4 curve and lens size.

If your frame is a replica, we cannot guarantee fitting. Original Ray-Ban lenses are cut for official Ray-Ban dimensions, and even a small difference in the metal rim can cause movement or prevent installation.

How to identify your model and size

Check the inside of the temple arm before ordering. You should find RB3637 followed by the lens size. This product is available in sizes 47, 50 and 53.

If the marking has worn away, measure the widest point of your old lens in millimetres or the inner opening of the rim. The right size matters: a 50 lens will not fit like a 53 lens.

Main features

Brand: Ray-Ban
Compatible model: RB3637
Product type: original lenses
Available sizes: 47, 50 and 53
Shape: Phantos
Lens curve: Base 4
Use: sunglasses
Audience: adult
Associated frame material: metal
Available diameters: 53 mm and 56 mm
UV400 protection: blocks 100% UVA/UVB rays

Available colours

31 – Green – Crystal
33 – Brown uniform – Crystal
3F – Blue gradient – Crystal
51 – Brown light gradient – Crystal
G1 – Green mirror blue – Crystal
G3 – Polar clear gradient dark grey – Crystal
G4 – Polar clear gradient dark green – Crystal

Material, protection and lens finishes

The options listed as Crystal are original Ray-Ban glass lenses. They keep the feel, weight and optical clarity expected from an official replacement. All versions provide UV400 protection for safe everyday sun use.

If you want polarised lenses, select a lens option that explicitly says Polar, such as G3 or G4. On original Ray-Ban polarised lenses, the logo may appear as Ray-Ban P.

Why replace only the lenses

The Ray-Ban RB3637 metal frame is built to last. If the bridge, rims and temples are still in good condition, replacing only the lenses is the smartest way to make your sunglasses look new again.

You also reduce waste by keeping a quality frame in use. At ReplacementLenses.net we work every day with original Ray-Ban lenses, and the right size gives the frame back its premium feel.

Authenticity and logo

We are an official EssilorLuxottica distributor. As original Ray-Ban lenses, they include the Ray-Ban logo; polarised versions may include the Ray-Ban P marking.

Each order is handled in our own optical workshop in Granada. Qualified opticians check lenses with a lensmeter, and we use professional MEI Easy Fit Trend equipment. Since 2018, we have repaired over 600,000 glasses and shipped more than 400,000 orders to over 50 countries.

Frequently asked questions

Will these fit Ray-Ban RB3447? We do not recommend using them for a different model. These lenses are specifically for Ray-Ban RB3637 and the rim geometry is model-dependent.

How do I choose between 47, 50 and 53? Look for the lens size printed inside the temple arm next to RB3637. If it is worn off, measure your old lens carefully in millimetres.

Are they original or compatible lenses? They are original Ray-Ban lenses, not generic compatible parts. That is why they keep the Ray-Ban logo and the correct RB3637 fit.

Do they provide real sun protection? Yes, they offer UV400 protection, blocking 100% UVA/UVB rays. This is essential for sunglasses used in strong daylight.

Are polarised options available? Yes, only the lens options marked Polar: G3 and G4. Choose one of those if polarisation is important to you.

Can I install them myself? The RB3637 is a metal frame, usually opened by a rim screw. If you are not used to this type of fitting, we recommend visiting an optician.

Additional information

color	31 – GREEN – CRYSTAL , 33 – BROWN UNIFORM – CRYSTAL , 3F – BLUE GRADIENT – CRYSTAL , 51 – BROWN LIGHT GRADIENT- CRYSTAL , G1 – GREEN MIRROR BLUE – CRYSTAL , G3 – POLAR CLEAR GRADIENT DARK GREY – CRYSTAL , G4 – POLAR CLEAR GRADIENT DARK GREEN – CRYSTAL
Size	47 , 50 , 53