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.

SmartWool NTS Micro 150 Pattern Crew for Men

SKU: SMTMPM

  • Form fitting Jersey knit
  • Crew with set-in sleeves
  • Shoulder panels
  • Flatlock seam construction

List: $79.95 $19.96 (25%)

Your Price: $59.99
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List: $75.99 $11.00 (14%)

Your Price: $64.99
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SmartWool NTS Micro 150 Pattern Crew for Women

SKU: SMTMPW

  • Form fitting Jersey knit
  • Stretch stitching
  • Side seams wrap to front
  • Tagless comfort

List: $79.95 $19.96 (25%)

Your Price: $59.99
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Marmot ThermalClime Pro LS 1/2-Zip for Men

SKU: MRMTP2ZM

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

Your Price: $60.00
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Minus33 Merino Wool Mid Weight 1/4 Length Zip for Women

SKU: MINMWQZW

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

List: $75.99 $11.00 (14%)

Your Price: $64.99
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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 Comp-4 Tech Fleece Crew for Men

5.0 (1 review)
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SKU: PMXC4TCM

  • 4-way power stretch fabric
  • Brushed fleece interior
  • Acclimate dry moisture wicking
  • Athletic fit

Your Price: $38.95
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List: $89.99 $13.50 (15%)

Your Price: $76.49
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Marmot Windridge Short Sleeve Shirt for Men

SKU: MRMWSSM

  • Ultraviolet protection factor (UPF) 50
  • Knit, polyester fabric
  • Tag-free neckline
  • Flat-locked seams
  • Mesh panels

Regular: $30.00 $10.05 (34%)

Starting at: $19.95
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ColdPruf Authentic 93 Crew for Men

SKU: CLDACM

  • Two layer engineering
  • Natural warmth barrier
  • Tagless
  • Flat seams

Regular: $20.99 $2.00 (10%)

Starting at: $18.99
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Minus33 Merino Wool MidWeight Bottoms - Men's

Mossy Oak Infinity

SKU: MINMBMMO

  • Merino wool
  • Interlock knit construction
  • Flat lock seams
  • Machine wash, dry

List: $80.99 $12.00 (15%)

Your Price: $68.99
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Mountain Hardwear MicroChill Zip T for Men

5.0 (2 reviews)
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SKU: MHWMCZMN

  • Center Back Length: 28.5 in. / 72 cm.
  • Flat-lock construction
  • High-cut collar
  • Flat-lock construction
  • Velous Micro Fleece

Regular: $55.00 $22.05 (40%)

Your Price: $32.95
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Icebreaker Everyday Leggings for Men (w/Fly)

SKU: ICBEVLM

  • Gusset
  • Material: Merino wool
  • UPF rating: 50+
  • Machine-washable
  • Flat-lock seams

Your Price: $59.99
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Adidas Techfit Capri Tight for Women

SKU: ADSTCTW

  • Moisture wicking
  • Advanced Techfit fabric
  • Anti chafe waistband
  • Side panels

Regular: $40.00 $17.05 (43%)

Your Price: $22.95
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Terramar Men's Thermawool CS 4.0 Crew

SKU: TRMMTW4C

  • Climasense fabric
  • Advanced odor control
  • Wicking, fast drying
  • Retains heat, breathable

Your Price: $26.95
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Minus33 Merino Wool Lightweight Bottoms for Women

SKU: MINLBW

  • 100% 17.5-micron Merino wool
  • 170 g/m2 jersey-knit construction
  • Flat-lock seams
  • Weight (size L): 6.1 oz. 
  • Machine-wash compatibility

List: $59.99 $9.00 (15%)

Your Price: $50.99
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Columbia Midweight II Long Sleeve Top for Men

SKU: COLM2LTM

  • Thermal reflective
  • Wicking technology
  • Active fit
  • Antimicrobial

Regular: $45.00 $21.05 (47%)

Your Price: $23.95
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ColdPruf Authentic 93 Pants for Men

SKU: CLDAPM

  • Two layer engineering
  • Natural warmth barrier
  • Tagless
  • Flat seams

Regular: $20.99 $2.00 (10%)

Starting at: $18.99
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Under Armour Coldgear Infrared Evo Cg Mock for Men

SKU: UNACIECM

  • Dual-layer fabric 
  • Thermo-conductive inner coating 
  • 4-Way Stretch fabrication 
  • Moisture transport system 
  • Quick-dry fabrication 

List: $54.99 $17.04 (31%)

Your Price: $37.95
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Minus33 Merino Wool MidWeight Crew Neck - Men's

Mossy Oak Infinity

SKU: MINMCMMO

  • Merino wool
  • Interlock knit construction
  • Flat lock seams
  • Machine wash, dry

List: $80.99 $12.00 (15%)

Your Price: $68.99
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