Base Layers

Browse and compare the lightest Base Layers for ultralight backpacking. Sort by weight, filter by brand, and find the best Clothing options for your loadout.

162 productsLightest46 gMedian165 gHeaviest440 g

–g

		vs Median
FinetrackDry Layer Basic T 2 variants	46 g	-72%
EkoiPerf Sunlight Sleeveless Base Layer 2 variants	47 g	-72%
IcebreakerMerino Blend 75 Cool-Lite Featherlight Short Sleeve Crewe 2 variants	55 g	-67%
CastelliThermoflex 2 Arm Warmer	61 g	-63%
FinetrackElemental Layer Cool Short Sleeve Crew 2 variants	72 g	-56%
TerramarThermasilk Heritage Long Sleeve Crew Shirt 2 variants	75 g	-55%
OdloActive F-Dry Light Eco Base Layer T-Shirt 2 variants	76 g	-54%
PatagoniaCapilene Cool Merino Blend Shirt 2 variants	88 g	-47%
UniqloWomen's HEATTECH Leggings 2 variants	89 g	-46%
PatagoniaCapilene Lightweight Bottoms	89 g	-46%
DecathlonMT500 Merino Wool T-Shirt 2 variants	91 g	-45%
PatagoniaMen's Capilene Cool Ultra Hoody 2 variants	94 g	-43%
CraftActive Extreme X Crew Neck	98 g	-41%
DecathlonMerino Tank Top MT500 2 variants	98 g	-41%
DecathlonMT500 Merino Wool Mountain Trek Tank Top 2 variants	98 g	-41%
ForclazMerino Top for Mountain Trekking Women's MT500 2 variants	98 g	-41%
PatagoniaCapilene Cool Lightweight Shirt	98 g	-41%
PatagoniaCapilene Lightweight Crew	99 g	-40%
UniqloAIRism Crew Neck T-Shirt 2 variants	99 g	-40%
ForclazBrassière en Laine Mérinos MT500	101 g	-39%
PatagoniaWomen's Capilene Cool Daily Shirt 2 variants	105 g	-36%
TerramarThermasilk Pointelle Pant (Silk Legging)	113 g	-32%
Helly HansenHH LIFA T-Shirt	115 g	-30%
RabSyncrino Base Tee	117 g	-29%
Under ArmourHeatGear Armour Short Sleeve Compression Shirt 2 variants	120 g	-27%
REI Co-opLightweight Base Layer Tights 2 variants	122 g	-26%
MilletTrilogy Wool TS LS	127 g	-23%
UniqloHEATTECH Ultra Warm Tights 2 variants	127 g	-23%
KuiuULTRA Merino 120 LT SS Crew-T	128 g	-23%
PatagoniaCapilene Cool Daily Shirt	128 g	-22%
PatagoniaCapilene Cool Daily Shirt - Boardshort Logo	128 g	-22%
HERMKOTank Top Merino/Tencel 2 variants	130 g	-21%
UYNEvolutyon UW Shirt 2 variants	130 g	-21%
Arc'teryxCormac Crew Neck Shirt LS 2 variants	135 g	-18%
DevoldBreeze Merino 150 Long Sleeve Base Layer 2 variants	135 g	-18%
IcebreakerMerino Blend 125 ZoneKnit	135 g	-18%
Yamatomichi100% Light Merino Long Sleeve 2 variants	135 g	-18%
LobtreeBase Alpha Direct 90 Thermal Legging	136 g	-18%
DecathlonMerino Resist Short-Sleeved T-Shirt 2 variants	137 g	-17%
DecathlonMerino Resist Short-Sleeve T-Shirt 2 variants	137 g	-17%
DecathlonT-shirt Merino Resist	137 g	-17%
PatagoniaLong-Sleeved Capilene Cool Merino Blend Shirt 2 variants	139 g	-16%
PatagoniaMen's Capilene Cool Merino Blend Shirt	139 g	-16%
Arc'teryxRho Bottom 2 variants	140 g	-15%
BrynjeClassic Wool Light T-shirt	140 g	-15%
BrynjeSuper Thermo LS Shirt 2 variants	140 g	-15%
BrynjeSuper Thermo Shirt	140 g	-15%
Super.NaturalBase Tee 140	140 g	-15%
Helly HansenHH LIFA Pant	142 g	-14%
BrynjeSuper Thermo Shirt w/ Shoulder Inlay	143 g	-13%
RabDryflo Tee	143 g	-13%
DecathlonForclaz Trek 500 Merino Wool T-Shirt (Merino Resist) 2 variants	145 g	-12%
ForclazMerino Resist Short-Sleeved T-Shirt 2 variants	145 g	-12%
FusionTechnical Merino 150 T-Shirt	146 g	-12%
UYNEvolutyon Xtreme UW Pants Long	147 g	-11%
ZpacksOcta Camp Pants 2 variants	147 g	-11%
DecathlonForclaz Merino Fresh Trekking T-Shirt 2 variants	148 g	-10%
DecathlonForclaz Travel 500 Merino Wool T-Shirt 2 variants	148 g	-10%
DecathlonMerino Fresh T-Shirt	148 g	-10%
DecathlonMerino Wool Short-Sleeve T-Shirt (Travel 500) 2 variants	148 g	-10%
ForclazMerinoshirt Herren kurzarm - Merino Fresh 2 variants	148 g	-10%
BrynjeWool Thermo Light Zip-Polo 3/4 Neck	150 g
FusionTechnical Merino 150 LS	150 g
IcebreakerMerino Blend 125 Cool-Lite Sphere Short Sleeve Tee 2 variants	150 g
PatagoniaCapilene Midweight Bottoms	158 g
AclimaLightWool 140 Classic Tee	158 g
Arc'teryxCormac Heavyweight Shirt LS 2 variants	160 g
FjällrävenAbisko Day Hike Half Zip 2 variants	160 g
Macpac220 Merino Long Johns 2 variants	160 g
The North FaceMen's Summit Series Pro 120 Crew	160 g
Arc'teryxRho	162 g
Ridge MerinoMen's Pursuit Ultralight Long Sleeve Merino Shirt 2 variants	162 g
DillingWomen's Merino Wool T-shirt 2 variants	165 g
Icebreaker125 ZoneKnit Long Sleeve Crew Thermal Top	165 g
IcebreakerMerino 175 Everyday	165 g
AclimaWoolNet 2 variants	166 g
Merino TechCrew Base Layer 2 variants	167 g
Mountain HardwearCrater Lake Hoody 2 variants	168 g
LLBeanMen's Silk Underwear, Crewneck	170 g
LLBeanMen's Silk Underwear, Pants	170 g
Macpac180 Merino Long Johns 2 variants	170 g
IcebreakerMerino 150 Anatomica Tank	171 g
Ortovox150 Cool Logo 2 variants	171 g
Ortovox150 Cool Logo LS	171 g
BrynjeSuper Thermo Zip Polo Shirt	173 g
IcebreakerMerino Blend 125 ZoneKnit Long Sleeve Crewe Thermal Top 2 variants	173 g
Icebreaker260 ZoneKnit Long Sleeve Crew	176 g
PatagoniaCapilene Cool Sun Hoody 2 variants	176 g
PatagoniaCapilene Midweight Crewneck	176 g
OdloBlackcomb Eco Base Layer Bottoms 2 variants	178 g
IcebreakerMerino 200 Oasis Thermal Leggings	178 g
KuiuULTRA Merino 120 LT LS Hoodie	179 g
Kari TraaRose Long Sleeve Baselayer 2 variants	179 g
PatagoniaCapilene Cool Daily Hoody 2 variants	179 g
PatagoniaMen's Capilene Cool Daily Hoody 2 variants	179 g
Arc'teryxRho LT Bottom 2 variants	180 g
Simond (Decathlon)Merinoshirt Herren kurzarm - Merino Resist 2 variants	180 g
SmartwoolIntraknit Thermal Merino Base Layer Crew	180 g
WoolpowerLong Johns 200	180 g
Helly HansenHH Active Flow Long Underwear Bottoms 2 variants	180 g
SmartwoolWomen's Intraknit Thermal Merino Base Layer Crew	181 g
DecathlonForclaz MT500 Merino Wool Legging Baselayer 2 variants	182 g
DecathlonMerinoshirt Herren langarm Trekking - Merino Fresh 2 variants	184 g
DecathlonMerinoshirt Langarm Travel 500 2 variants	184 g
RabForce Hoody 2 variants	187 g
Ridge MerinoMen's Aspect Midweight Merino Wool Base Layer Bottoms 2 variants	187 g
ForclazMT500 Merino Wool Base Layer Tights 2 variants	190 g
Kari TraaSmekker Long Sleeve Baselayer 2 variants	190 g
KuiuVital S3 Zip-Off Bottom	190 g
StormbergUll Stilongs	195 g
Icebreaker200 Oasis Leggings with Fly 2 variants	199 g
UrbergLyngen Merino T-Shirt 2.0	202 g
PatagoniaMen's Capilene Thermal Weight Baselayer Zip-Neck Pullover	206 g
DuckworthVapor Tee 2 variants	207 g
REI Co-opMerino 185 Base Layer Bottoms 2 variants	210 g
SimondMT500 Long-sleeve 100% Merino Wool T-shirt 2 variants	210 g
MacpacLyell 180 Merino T-Shirt	215 g
IcebreakerMerino 200 Oasis Long Sleeve Crewe Thermal Top 2 variants	217 g
DevoldDuo Active Merino 205 Shirt Man	220 g
ForclazTrek 500 Long Sleeved Merino Wool Hiking T-Shirt 2 variants	221 g
Helly HansenLIFA Merino Midweight Crew Base Layer 2 variants	221 g
KuiuVital S3 Zip-T Hoodie	221 g
ForclazMT500 Merino Wool Long-sleeve Shirt	222 g
MeriwoolMerino 250 Base Layer Bottom	224 g
XTM PerformanceMen's Merino 230 Wool Long Sleeve Thermal Top	225 g
SmartwoolClassic Thermal Merino Base Layer Bottom	227 g
SmartwoolIntraknit Thermal Merino Base Layer Hoodie	235 g
RegattaBeru Merino Wool Base Layer Top 2 variants	236 g
SmartwoolClassic Thermal Merino Base Layer Crew 2 variants	236 g
SmartwoolIntraknit Thermal Merino Base Layer Bottom	238 g
IcebreakerMerino 260 Tech Thermal Leggings	240 g
DillingMen's Merino Wool Long Sleeve Top 2 variants	241 g
DecathlonForclaz MT500 Merino Wool Long-Sleeve T-Shirt 2 variants	243 g
DecathlonMerino Resist Long-Sleeve Zip T-Shirt 2 variants	243 g
ForclazTrek 500 Merino Wool Backpacking Tights 2 variants	247 g
SwixRaceX Classic Pants 2 variants	249 g
UniqloHEATTECH T-Shirt	264 g
RevolutionRaceDownhill Base Layer Pants 2 variants	266 g
SmartwoolClassic Thermal Merino Crew Base Layer Top	275 g
SmartwoolMerino 250 Baselayer Crew	275 g
SmartwoolMerino 250 Base Layer Long Sleeve Crew	276 g
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top 2 variants	280 g
PatagoniaR1 Air Zip-Neck 2 variants	289 g
SmartwoolClassic Thermal Merino Base Layer 1/4 Zip	298 g
SmartwoolClassic Thermal Merino Base Layer Hoodie	318 g
ForclazMT900 Merino Wool Long-Sleeved Trekking T-Shirt	350 g
PudollaActive Compression Running Tights	355 g
StoicMerino Composite 230 1/4 Zip Top 2 variants	408 g
WoolpowerCrewneck 200	440 g
DecathlonForclaz MT500 100% Merino Wool Long-sleeve Shirt	—
DillingMen's Merino Wool Long Johns with Fly	—
Icebreaker200 GT Longsleeve Zip	—
IsobaaMerino 320 Long Sleeve Half Zip	—
Land's EndSilk Interlock Long Sleeve Crewneck Long Underwear Top	—
Land's EndSilk Long Underwear Pants	—
Living CraftsHarvey Long-Sleeved Undershirt	—
MacpacMen's 180 Merino Pullover	—
MECT1 Merino Baselayer Long Sleeve Top	—
Merino Tech250 Crew Base Layer Top	—
OdloMerino 200 Base Layer T-Shirt	—
Under ArmourUA Tech 2.0 Half-Zip Long Sleeve Shirt	—
XTM PerformanceMen's Merino 230 Wool Thermal Pants	—