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UP TO 40% OFF SELECT STYLES: Get up to 40% off select styles at Merrell.com from 10/21/2026 - 10/28/2026 until 11:59PM EST. Prices as marked to reflect the discount, no code necessary. Purchase quantities may be limited. Not valid on Merrell Prodeal orders, purchases of gift cards or e-cards, prior purchases, purchases at retail stores, or purchases on other websites. Cannot be combined with any other offer, promotion, coupon or discount. Not redeemable for cash or credit unless required by law. Valid on merrell.com U.S. orders only. Offer may change or end at any time. Void where prohibited by law. Additional restrictions may apply.

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Get 15% Off Your Order: Enjoy 15% off your order at merrell.com. Use code at checkout to activate. Promotion codes have no cash value. This offer is not valid on ProDeal purchases, prior purchases, gift cards or e-cards, or purchases from retail stores or other websites. It cannot be combined with any other coupon or discount. Offer valid on Merrell.com US orders only. Void where prohibited by law. Additional restrictions may apply. Offer may change at any time.

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Women's Siren 4 Thermo Lace Waterproof

$190.00

1/8

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 1

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 2

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 3

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 4

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 5

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 6

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 7

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 8

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 1

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 2

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 3

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 4

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 5

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 6

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 7

Siren 4 Thermo Lace Waterproof, Tobacco, dynamic 8

Women's Siren 4 Thermo Lace Waterproof

$190.00

Select a Type: Lace

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Size

Size Chart

Size Guide

Women's Footwear Size Chart
US Women's Size	UK	EU	JPN	US Men's Conversion
5	2.5	35	22	3.5
5.5	3	35.5	22.5	4
6	3.5	36	23	4.5
6.5	4	37	23.5	5
7	4.5	37.5	24	5.5
7.5	5	38	24.5	6
8	5.5	38.5	25	6.5
8.5	6	39	25.5	7
9	6.5	40	26	7.5
9.5	7	40.5	26.5	8
10	7.5	41	27	8.5
10.5	8	42	27.5	9
11	8.5	42.5	28	9.5
11.5	9	43	28.5	10

We are happy to offer free returns and exchanges. See more details regarding our return and exchange policy.

Product Locator by Locally

Please select Size and Width

Made for crisp mornings, snowy strolls, and everything winter brings, the Siren 4 Thermo Lace Waterproof wraps your feet in cozy warmth with a women’s-specific fit designed for all-day comfort. Soft faux fur details and reliable weather protection help keep the cold out, while confident traction lets you enjoy every step from neighborhood walks to snow-covered trails.

• 200 grams PrimaLoft® Gold Eco Series synthetic insulation
• Waterproof membrane seals out water and lets moisture escape
• FloatPro™ foam midsole with exceptional energy return and enduring comfort
• Vibram® ICETREK outsole designed to provide improved grip on cold, icy, or snowy surfaces
• FloatPro™ foam footbed for enhanced cushioning and energy return
• Waterproof coated leather upper
• Waterproof pig suede leather upper
• Medial zipper for easy on and off
• Bellows tongue keeps out debris
• 100% recycled laces
• TPU waterproof shell for additional protection
• Faux fur lining
• 100% recycled mesh footbed cover
• Drop: 8mm
• Lug: 5mm
• Shaft Height (top of midsole to top of boot): 6in
• Half pair weight: 0lbs-15.16oz, 430g