Semibold Slate Performance Crew Socks

Performance Coolmax® crew socks built for breathability, quick-dry comfort, and compression support in motion.
$144.00
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BEST FOR
Training & Gym
Running
CUSHION
Medium Cushion Medium Cushion
FIT
FEEL
WHY YOU’LL LOVE THIS

A versatile grey elevated by a spark of sunbeam yellow. It’s a reminder that even the most routine training can be bright. Features full Coolmax® moisture-wicking and a secure, non-slip fit for all-day performance.
PRODUCT DETAILS

Material Benefits

  • Rapid Drying Comfort: Keeps feet moisture-free
    Breathable Performance: Improves airflow
    Friction Protection: Prevents blisters
    Cooling Function: Dissipates heat
    Long-Term Durability: Maintains shape

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
Signature Smile
A playful touch that celebrates every step
Arch Spine
Reinforces natural arch support
Curve padding
Adds soft support to stabilize your arch
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

Slate: Consistency Creates Change.

Inspired by the grit of slate and concrete. Training is often a repetitive grind, but that small yellow detail represents the "breakthrough"—the light at the end of the routine when hard work turns into results.

If you’re drawn to Slate, you trust the process. You understand that real change is built slowly, step by step.

The "Weightless" Arch

Experience a gentle, constant lift that mimics your foot’s natural mechanics. It’s designed to keep your feet feeling light, supported, and ready for more.

Joint-Protecting Cushion

We’ve placed extra softness where the impact is highest. This targeted padding absorbs energy from the ground, keeping your gait smooth and effortless.

Gentle Heel Lockdown

A soft, specialized cushion at the back of the ankle prevents collar-rub, ensuring your training is defined by comfort, not friction.

FAQ

Are Coolmax® socks better than cotton for workout?

Absolutely. For any physical activity, Coolmax® socks are superior to cotton. Cotton stays wet, which leads to friction, discomfort, and bacteria growth. Coolmax® is a hydrophobic fiber that dries almost instantly. This specialized breathable performance fabric ensures your feet remain at an optimal temperature, preventing the "soggy" feeling that often ruins a good workout session.

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.

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.

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.