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

Mammut Go Dry Longsleeve Zip Baselayer Womens

SKU: MMTGDZW

  • All season baselayer
  • Highly technical
  • Stretchy mobility
  • Quick-drying

Regular: $70.00 $27.05 (39%)

Your Price: $42.95
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Sale

Regular: $34.95 $5.00 (14%)

Starting at: $29.95
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Sale

Mammut Go Warm Baselayer 3/4 Pants for Women

SKU: MMTGW3PW

  • Contoured cut
  • 100% polyester microfiber
  • Antimicrobial feature
  • Merino wool and polyester blend

Regular: $49.00 $19.05 (39%)

Starting at: $29.95
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Sale

SmartWool Midweight Pattern Crew Top for Men

SKU: SMTMPCM

  • 100% Merino Wool
  • Form Fitted
  • Interlock Knit
  • Shoulder Panels
  • Flatlock Seams

Regular: $90.99 $25.00 (27%)

Your Price: $65.99
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Sale

Mammut Go Warm Longsleeve Baselayer for Women

SKU: MMTGWLW

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

Regular: $75.00 $40.05 (53%)

Starting at: $34.95
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SmartWool Midweight Pattern Crew Top for Women

SKU: SMTMPCW

  • 100% Merino Wool
  • Form Fitting
  • Jacquard Knit
  • Back Body Seam
  • Shoulder Panels

List: $105.00

Your Price: $104.95
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Sale

Regular: $38.95 $4.00 (10%)

Starting at: $34.95
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SmartWool NTS Micro 150 Pattern Crew for Men

SKU: SMTMPM

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

Your Price: $79.95
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Sale

Mammut Go Warm Baselayer Pants for Women

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SKU: MMTGWPW

  • Contoured cut
  • Merino wool and polyester microfiber
  • Antimicrobial feature
  • Body Mapping technology

Regular: $60.00 $30.05 (50%)

Starting at: $29.95
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Sale

Mammut Go Warm Longsleeve Shirt Baselayer for Men

SKU: MMTGWSM

  • Extended back
  • Contoured cut
  • Body Mapping technology
  • Polyester microfiber
  • Antimicrobial feature

Regular: $49.95 $5.00 (10%)

Starting at: $44.95
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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
  • Form fitting

Your Price: $79.95
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Sale

Regular: $60.00 $25.05 (42%)

Your Price: $34.95
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Sale

Regular: $84.95 $28.96 (34%)

Starting at: $55.99
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SmartWool NTS Micro 150 Pattern Bottom for Women

SKU: SMTBOW

  • Form fitting natural rise
  • Jersey knit with UPF 30
  • Wide elastic waistband
  • Flatlock seam construction

Your Price: $79.95
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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%)

Starting at: $27.95
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List: $85.00

Your Price: $84.95
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List: $45.00 $16.05 (36%)

Your Price: $28.95
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SmartWool NTS Midweight 250 Pattern Bottom for Men

SKU: SMTPNM

  • Heaviest baselayer fabric
  • Covered elastic waistband
  • Traditional fly design
  • Flatlock seams

Your Price: $99.99
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SmartWool NTS Midweight 250 Zip T for Women

SKU: SMTZTW

  • Standalone or under-layer
  • 8 inch center front zip
  • Back seam wraps to front
  • Breathable, odor resistant

Your Price: $99.99
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SmartWool NTS Micro 150 Bottom for Men

SKU: SMTBTM

  • Lightweight base layer
  • Form fitting Jersey knit
  • Flatlock seams
  • Fully functional fly

List: $75.00

Your Price: $74.95
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