Semibold Heart Performance Crew Socks

Quick-dry Coolmax® crew socks with airflow mesh and compression support for running and active lifestyles.
$144.00
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True to size. If you're between sizes, size up.
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Comfort guarantee
BEST FOR
Training & Gym
Running
CUSHION
Medium Cushion Medium Cushion
FIT
FEEL
WHY YOU’LL LOVE THIS

Designed for those who believe in the power of connection. This performance crew combines moderate compression with a seamless toe and target cushioning for a distraction-free workout. High-tech Coolmax® fibers move moisture away from the skin, while the split-heart design creates a whole when your legs come together.
PRODUCT DETAILS

Material Benefits

  • Quick-Dry Technology: Removes sweat fast
  • Ventilation System: Promotes airflow
  • Friction Reduction: Minimizes hot spots
  • Cooling Balance: Controls temperature
  • Durable Wear: Maintains structure

Key Features

Dual-Side Forefoot Cushioning
Reduces friction during quick direction changes
3-in-1 Arch Support System
Enhances support, cushioning, and stability
Breathable Instep Mesh
Keeps feet cool and dry during movement
Graduated Compression Support
Improves circulation and reduces fatigue
Anatomical fit
Designed to match your natural foot shape
Hand-Finished Seamless Toe
Minimizes friction for a smoother feel
Target Cushion
Absorbs impact in high-pressure areas
Stride Lock
Keeps socks secure without slipping
Midfoot Hugging Ring
Holds your foot in place for stability
Breathable Toe Ventilation
Reduces moisture between toes
Achilles Comfort Padding
Prevents rubbing at the heel collar
Arch Spine
Reinforces natural arch support
Signature Smile
A playful touch that celebrates every step
MATERIALS & CARE

65% CoolMax®, 32% Nylon, 3% Lycra

Machine wash cold
Turn inside out
Do not dry clean
Do not iron
Tumble dry low
No bleach
SHIPPING & RETURNS

Free Shipping Over $49 + 30-day Easy Returns

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ADULT SIZING

True to size. If you're between sizes, size up.

SOCK SIZE
S/M
M/L
ONE SIZE
US
W5–9 / M3–7
W9½–12½ / M½–13
W5–12½ / M3–13
EU
36-40
41-46
36-46
UK
3-7
8-12
3-12
FR
36-38
38-40
36-40
IT
40-42
42-44
40-44
JP
7-9
9-11
7-11
KR
55-56
66-77
55-77
AU
8-10
10-12
8-12
DE
34-36
36-38
34-38
DK
34-36
36-38
34-38

 FOOT MEASUREMENTS
S/M
M/L
IN
8.5-10
10-11
CM
22-25.5
25.5-28

TOE SOCKS SIZING

SOCK SIZE
 ONE SIZE
US
W5–9 / M3.5–7.5
EU
35–40
UK
3-7
FR
35-38
IT
39–42
JP
22-25.5
KR
220–255
AU
5–9
DE
34-38
DK
34-38

BABY SIZING

AGE 
FOOT LENGTH
EU SHOE SIZE
US SHOE SIZE
6 months -3 Years
4.3–5.1 in / 11-13 cm
16-21
1.5-6

DESIGN STORY

Heart: Still One.

This is a story about connection. Each half might look abstract on its own, but together they form a symbol of unity. It’s a tribute to the strength found in support, whether from a teammate, a partner, or yourself.

If you’re drawn to this design, you believe in something shared—the quiet strength of moving with someone, not alone.

Cloud-Like Achilles Shield

We’ve added a plush buffer at the heel to eliminate shoe-rub. Experience a smooth, irritation-free stride that keeps blisters at bay, no matter the distance.

Natural Arch Alignment

Feel the gentle lift of our Arch Spine and Hugging Ring. By supporting your foot’s organic shape, it minimizes strain and keeps your energy high from start to finish.

Stay-Put Ventilation

Engineered with moderate compression and Stride Lock mesh, these socks offer a secure, "second-skin" fit that breathes deeply while staying exactly where you want them.

FAQ

Which seasons and activities are best for Coolmax® socks?

While Coolmax® is the undisputed champion for summer heat and high-intensity training (like HIIT, running, and fitness), it is truly a multi-season fiber. Its ability to keep feet dry makes it excellent for any scenario where you might sweat, from spring hiking to intense indoor gym sessions. It is the go-to choice for athletes who prioritize thermal regulation and dryness year-round.

Do these Coolmax® socks help prevent blisters during high-intensity training?

Yes. Blisters are primarily caused by the combination of heat, moisture, and friction. Because Coolmax® eliminates moisture and reduces "hot spots" through its rapid-dry technology, it creates a much smoother environment for your skin. When paired with our anatomical fit, these socks act as a protective barrier that significantly lowers the risk of friction-induced blisters during your most demanding training sessions.

Why do Semibold Coolmax® socks feature compression at the Achilles and arch?

We designed our Coolmax® series with moderate graduated compression for two critical reasons:

  • Stability: During high-intensity movement, it ensures the sock stays perfectly in place without sliding or bunching.
  • Recovery: Gentle pressure stimulates peripheral blood circulation, which helps reduce foot fatigue and that "heavy" feeling after a long workout. Semibold uses a moderate pressure profile, meaning you get all the performance benefits and increased sensory feedback without the discomfort of a "too-tight" fit.

We use a balanced compression level, supportive enough to enhance performance, but comfortable enough for extended wear without feeling tight or restrictive.

Can I wear Coolmax® socks in the winter? Will they feel cold?

Yes, especially for active winter sports. While Merino wool is better for static warmth, Coolmax® is ideal for winter activities where you still sweat (like indoor training or heavy-duty gym work). By keeping your feet dry, it prevents the "evaporative cooling" effect that happens when sweat turns cold against your skin, helping you maintain a consistent temperature.