Base Layers & Mid Layers

SunnySports.com offers a wide variety of base, mid layers & thermal underwear to be worn in any conditions. These undergarments are sweat-resistant, quick-dry, and durable. We carry tops and bottoms from high quality brands such as Under Armour, Terramar, and SmartWool. Wearing these performance underwear underneath your outfit ensures a comfortable and dry adventure in the outdoors. Whether you're looking for leggings, tights, thermals, or a layer to keep your torso warm and dry, we have what you are looking for.

Sale

ColdPruf Premium Performance 49 Crew for Women

SKU: CLDPPCW

  • Single layer engineering
  • Polyester, spandex
  • Max dryness, antimicrobial
  • Trim fit

Regular: $20.99 $6.00 (29%)

Starting at: $14.99
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Sale

ColdPruf Performance 98 Crew for Men

SKU: CLDPRCM

  • Single layer engineering
  • Max dryness, antimicrobial
  • Moisture management
  • Polyester, spandex

Regular: $18.99 $2.00 (11%)

Your Price: $16.99
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Sale

ColdPruf Performance 58 Crew for Women

SKU: CLDPRCW

  • Single layer engineering
  • Max dryness, antimicrobial
  • Moisture management
  • Polyester, spandex

Regular: $18.99 $2.00 (11%)

Starting at: $16.99
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Sale

Mountain Hardwear Super Power Arm Warmer for Men - Black

SKU: MHWSPAWN

  • Body: Super Power Brushed jersey
  • Stretch fabric
  • Tonal reflective print
  • Wicking, fast drying
  • Flat-lock seam construction

Regular: $30.00 $16.05 (54%)

Your Price: $13.95
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SmartWool NTS Microweight 150 Pattern Crew Top for Men

SKU: SMTMWPCM

  • Jersey Knit Construction
  • Flatlock Seam Design
  • Form Fit
  • Stripe Tape Binding

List: $80.00 $20.05 (25%)

Your Price: $59.95
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Sale

Outdoor Research Frescoe Henley for Women

SKU: ORSFRHW

  • Dri-release E.C.O. fabric
  • Lightweight and Button front
  • Built-in FreshGuard odor neutralization
  • Button front

Regular: $48.00 $28.05 (58%)

Your Price: $19.95
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Terramar Kashmir HG V-Neck 1.0 for Women

SKU: TRMKHV1W

  • HG Climasense heat generating technology
  • Soft, breathable, and fast-drying
  • Antimicrobial finish
  • Brushed surface
  • UPF rating 25+

Your Price: $16.95
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Sale

SmartWool NTS Microweight 150 Pattern Crew Top for Women

SKU: SMTMWPCW

  • Soft, Non-Irritating Material
  • Shaped Bottom Hem
  • Lightweight
  • UPF Rating Of 30

Regular: $69.99 $25.00 (36%)

Your Price: $44.99
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Polarmax Maxride Crew for Women

SKU: PMXMRCW

  • Layering piece, or wear it alone
  • Contrast stitch
  • Machine wash & dry, no shrinking
  • Lightweight rib knit
  • Anti-microbial to prevent any scent

Your Price: $17.95
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Minus33 Merino Wool Mid Weight Crew Neck for Men

SKU: MINMWCM

  • 100% 18.5 Micron Merino Wool
  • 230 g/m2 Interlock knit construction
  • Flat lock seams

List: $65.99 $9.50 (14%)

Your Price: $56.49
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Sale

Marmot ThermalClime Sport LS Crew Shirt for Men

SKU: MRMTLSCM

  • Quick drying
  • Moisture wicking
  • Stretch elastane
  • Flat lock seams

Regular: $42.00 $17.05 (41%)

Your Price: $24.95
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Sale

Mammut Go Warm T-Shirt Baselayer for Women

SKU: MMTGWTW

  • Contoured cut
  • Extended back
  • 100% polyester microfiber
  • Merino wool and polyester mix
  • Antimicrobial feature

Regular: $60.00 $32.05 (53%)

Your Price: $27.95
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Sale

SmartWool Midweight Crew Top for Men

4.5
(4 reviews)
Ratings Distribution
  • 5 Stars
     
    (3)
  • 4 Stars
     
    (0)
  • 3 Stars
     
    (1)
  • 2 Stars
     
    (0)
  • 1 Stars
     
    (0)

SKU: SMTMDCM

  • 100% Merino Wool
  • Form Fit
  • Crew neck with set-in sleeves
  • Shoulder panels
  • Flatlock seam construction

Regular: $85.99 $37.99 (44%)

Starting at: $48.00
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Sale

Terramar Men's Helix Long-Sleeve Poly Crew Shirt

5.0
(2 reviews)
Ratings Distribution
  • 5 Stars
     
    (2)
  • 4 Stars
     
    (0)
  • 3 Stars
     
    (0)
  • 2 Stars
     
    (0)
  • 1 Stars
     
    (0)

SKU: TRMMHC

  • Lightweight Temperature-Control Layer
  • Highly Breathable and Fast-Drying
  • Non-Sticky
  • 100% Micro Denier Polyester
  • Anti-microbial

Regular: $12.95 $3.00 (23%)

Your Price: $9.95
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Sale

Marmot ThermalClime Pro Boot Long Sleeve Crew for Men

SKU: MRMTPLCM

  • Flat locked seams
  • Recycled polyester
  • Polartec technology
  • Moisture wicking

Regular: $50.00 $17.05 (34%)

Your Price: $32.95
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List: $65.99 $9.50 (14%)

Your Price: $56.49
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Marmot ThermalClime Sport LS Crew for Women

SKU: MRMTLSCW

  • Polartec power dry
  • Upcycle product
  • Quick drying, moisture wicking
  • Stretch elastane

Your Price: $42.00
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Sale

Mammut Go Warm Longsleeve Zip Baselayer for Men

SKU: MMTGWZM

  • Contoured cut
  • Extended back
  • Zip with zip-store
  • 100% polyester microfiber
  • Merino wool and polyester mix

Regular: $77.00 $32.05 (42%)

Your Price: $44.95
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SmartWool Midweight Crew Top for Women

SKU: SMTMDCW

  • Upf 50+ protection
  • Back Body Seam Wraps
  • Shoulder Panels
  • Flatlock Seam Construction 
  • Heat Transfer Logo

List: $95.00 $25.01 (26%)

Your Price: $69.99
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